Of Wire, Rod, Tube Or Filament Patents (Class 156/158)
  • Patent number: 4969705
    Abstract: The present invention involves a multiple cavity optical fiber splice made of a unistructural mass of inherent shape memory polymer material. The unistructural mass has a longitudinal dimension with opposite ends which includes at least a first bore at one end and at least a second bore and a third bore at the other end wherein the bores go into the mass and at least two connect to each other. The unistructural mass has two shapes, the first shape is a unique, recoverable, predetermined inherent shape wherein each bore has a preset diameter to accommodate and tightly hold end segments of denuded optical fibers of predetermined diameter and the second shape is a deformed shape which may be caused by solvent swelling and partial shrinking of the inherent memory polymer material such that each bore has enlarged predetermined diameters greater than the diameters of the segments of the denuded optical fibers so as to freely receive the end segments of the denuded optical fibers.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: November 13, 1990
    Assignee: Kingston Technologies, L.P.
    Inventors: Vladimir A. Stoy, Francis T. Delahanty
  • Patent number: 4969972
    Abstract: A device for welding tubular components of thermoplastic material. The device includes a heating device for generating the necessary melting temperature arranged at the circumference and at the abutting ends of the tubular components. The bag or casing is arranged in the region of the welded connection inside the tubular components. The bag or casing is capable of being expanded and pressed against the inner circumference of the tubular components. Pressing the casing against the inner circumference of the tubular components prevents the formation of a welding bead during the welding procedure and serves to generate a welding pressure. After welding has been carried out, the casing is radially contracted and removed from the tubular components.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: November 13, 1990
    Assignee: Georg Fischer AG
    Inventor: Peter Kunz
  • Patent number: 4964688
    Abstract: An optical fiber connector element comprises a connector body having a passage extending therethrough, the passage having a forward portion for receiving an optical fiber and a rearward portion which is wider than the forward portion for receiving an optical fiber and surrounding protective material, and an optical fiber stub secured within the forward portion of the passage, the optical fiber stub having a forward end surface which has an optical finish. The connector element is used to terminate an optical fiber cable by cutting the cable to a desired length, stripping back an end portion of protective material surrounding an optical fiber of the cable to expose an end portion of the optical fiber, and securing the exposed fiber end portion and an end portion of the protective material remaining on the fiber in the connector body passage with the fiber end portion in abutment and axial alignment with the fiber stub.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: October 23, 1990
    Assignee: Northern Telecom Limited
    Inventors: Kevin G. Caldwell, Steve J. Lischynsky, Elza V. Seregelyi
  • Patent number: 4964689
    Abstract: A connector splicing optical fibers wherein a glass sleeve, having a precision cut bore formed therein, is provided with funnel-shaped access openings at each end thereof for receiving the ends of the glass fibers to be spliced. In one embodiment, a permanent splice is made by applying a bonding agent and sealant to the funnel-shaped openings, and in another embodiment, a retainer ring is employed to thereby provide a disconnectable splice.
    Type: Grant
    Filed: November 7, 1978
    Date of Patent: October 23, 1990
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Howard Wichansky
  • Patent number: 4963421
    Abstract: First and second members (e.g. pipes, fittings) of cross-linked polyolefinic material such as polyethylene having a melt flow index (MFI) of zero are joined using a third member of polyolefinic material such as polyethylene having a higher MFI e.g. 0.3. The first member 10 and the third member gripped by clamps 18, 20 of a butt fusion machine are pressed against opposite faces of a heater plate which is then withdrawn and the members are pressed together by the clamps. Only the third member is upset to form beads 24, 26. Part of the third member is removed leaving a stub part 16. The second member is joined to the stub's face 36 using the heater plate. The part 16 is upset leaving a thin wafer 48. The two interfaces 30, 50 limit the growth of cracks in the wafer to prevent their propagation through the pipe thickness under hoop stress. The beads are preferably removed at each stage.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: October 16, 1990
    Assignee: British Gas plc
    Inventors: Alan J. Dickinson, Trevor G. Stafford
  • Patent number: 4957570
    Abstract: The invention relates to the butt-welding of pipes of plastics materials. Equipment is alreaady known where pipe ends are first urged against a trimmer plate, and then urged against a heater plate to create beads of a required size at the ends of the pipes, following which the pipe ends are urged into abutting relationship for welding to occur. Particularly with automatic machines employing hydraulic power, the force applied between the pipe ends and the heater plate and subsequently between the pipe ends needs to include an allowance for the drag factor inherent in the pipeline and compensate for any frictional effect in the mechanical and hydraulic moving components, and which is a difficult calculation.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: September 18, 1990
    Assignee: Fusion Group PLC
    Inventors: Patrick W. Jenkins, Edwin A. W. Dunkey, Roy Cartwright
  • Patent number: 4950318
    Abstract: A method of forming an optical fiber joint between a pair of elongated optical fibers each of which has a longitudinal axis surrounded by a core and cladding having different refractive indices and forming a single-mode light-guiding region, the core and cladding of each fiber having non-circular transverse cross-sections defining two polarization-maintaining axes of birefringence transverse to the longitudinal axis of the fiber. Each of the fibers also has predetermined external flat reference surfaces for locating the core and cladding and the axes of birefringence within each fiber from the exterior geometry of the fiber.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: August 21, 1990
    Assignee: Andrew Corporation
    Inventor: Richard B. Dyott
  • Patent number: 4936649
    Abstract: A damage detection and evaluation system utilizes optical fibers to detect and assess damage to a structure. The optical fibers are intermittently etched in a controlled manner to weaken them so they fracture when a desired load is applied to the structure. Where visual inspection of the optical fibers is used to check for damage, a reference set of optical fibers is used. Where photodetection is used and minimal connections to the structure are required, one end of the optical fiber is made reflecting so an optical connection is only made to the other end. To further simplify the connection, a single input/output optical connection to a demultiplexing/multiplexing chip mounted on or within the structure is provided. Where orthogonal grids of fibers are not possible, the invention provides interdigitated optical fibers and volume backscattering to locate the position of the first fracture along the length of the optical fiber.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: June 26, 1990
    Inventors: John D. Lymer, Neil D. W. Glossop, W. Dayle Hogg, Raymond M. Measures, Roderick C. Tennyson
  • Patent number: 4933036
    Abstract: Two thermoplastic tubes are welded together by pre-cutting the tubes to create two ends which are axially aligned when placed in a holding device. A wafer is inserted in the space between the cut ends and the wafer is heated to melt the cut ends while the cut ends are in a non-flattened condition. After the wafer is removed the melted cut ends are pressed against each other to weld the cut ends together.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: June 12, 1990
    Assignee: Denco, Inc.
    Inventors: John B. Shaposka, Dudley W. C. Spencer
  • Patent number: 4931116
    Abstract: A coupler for joining polymeric pipes comprises a generally cylindrical radially heat-shrinkable member which is composed of a conductive polymer. To recover the coupler, current is passed axially through the coupler via electrodes. The coupler has a center portion of increased wall thickness and in this way, when there is a gap between the pipes, overheating of the center portion of the coupler is avoided.
    Type: Grant
    Filed: August 25, 1987
    Date of Patent: June 5, 1990
    Assignee: Raychem Corporation
    Inventor: Nachum Rosenzweig
  • Patent number: 4931120
    Abstract: A device for connecting optical fibers is formed by inserting one or more fibers into at least one end of a capillary tube. The bore is tapered to facilitate fiber insertion. To taper the end of a bore, the tube is rotated about its longitudinal axis while a first narrow stream of abrasive particles is directed onto the tube end. The axis of the first stream is located off the axis of the tube bore, thereby forming a taper that is spherical rather than conical. A second stream, the axis of which is coaxial with the bore, is then directed onto the tube end to remove that portion of the tapered aperture adjacent the bore, thereby forming a more funnel-shaped aperture.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: June 5, 1990
    Assignee: Corning Incorporated
    Inventor: William R. Christoff
  • Patent number: 4929293
    Abstract: The method of joining together the ends of ducts made of melt processible fluoropolymers such as Teflon PFA, which are characterized by a high degree of chemical inertness and a continuous service temperature in the range of 300.degree. to 500.degree. F. The joining of the ends together is accomplished by the use of infrared heat emanating from an infrared heat source with temperatures in the range of 1250.degree. to 2000.degree. F. and spaced from the ends of the duct by approximately 1/4" to 2 inches for a period of time approximately up to one minute which may be gauged by the appearance of the duct end as it becomes visibly molten to a depth of approximately 1/2". The infrared heater is then removed and the ducts are put together under almost no pressure and the ducts are held briefly, in one form, less than a minute, to quickly establish a joint that becomes at least as strong and expectedly stronger than the original ducts.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: May 29, 1990
    Assignee: Fluoroware, Inc.
    Inventor: Michael L. Osgar
  • Patent number: 4927642
    Abstract: An apparatus for welding tubular components of thermoplastic material. The apparatus includes a heating device for heating the ends of the tubular components to be welded together until the melting range of the thermoplastic material is reached. Two outer support rings which are slid toward each other after the thermoplastic material has melted and an expandable inner support member ensure that welding pressure is built up, so that a welded connection can be obtained which is strong and free of welding beads.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: May 22, 1990
    Assignee: Georg Fischer AG
    Inventor: Peter Kunz
  • Patent number: 4923540
    Abstract: The invention relates to a method of joining two bevelled rod ends composed of plastics material reinforced with long fibres, using a shrinkable tube.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: May 8, 1990
    Inventors: Eberhard Born, Helmut Korber, Josef Mersch
  • Patent number: 4921570
    Abstract: An apparatus for manufacturing a welded connection of tubular components of thermoplastic material includes a bracing device and a heating device to be inserted into the tubular components. The heating device has an expandable hollow body, in the interior of which are arranged an electric heating element and a liquid which expands when heated. When the heating device is heated, the hollow body rests against the ends of the tubular components to be welded together and the necessary welding temperature is transmitted to these components. Since the hollow body rests against the inner circumference of the tubular components, the formation of a welding bead is prevented. After welding has been carried out, the hollow body which has cooled and shrunk is removed by means of a traction strand.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: May 1, 1990
    Assignee: Georg Fisher AG
    Inventor: Peter Kunz
  • Patent number: 4913756
    Abstract: Two thermoplastic tubes are welded together in a process which includes severing the tubes by a severing wafer having a temperature of about 350.degree. F. to create two cut sections. The severing wafer is removed from the space between the tubes and a hot wafer having a temperature of 500.degree.-1200.degree. F. is inserted in the space to radiantly heat the tube ends so that they are welded when pressed-together while in an unflattened and open condition.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: April 3, 1990
    Assignee: Denco, Inc.
    Inventors: John B. Shaposka, Dudley Spencer
  • Patent number: 4911520
    Abstract: A fiber optic switch has a fixed member and a movable member mounted for cantilevered movement with respect thereto. Both of the members are fabricated from borosilicate glass.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: March 27, 1990
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Jerald D. Lee
  • Patent number: 4906313
    Abstract: A fusion weld method and assembly for forming a fusion welded joint between abutting pipe sections having the same exterior diameter and having a predetermined melting temperature. The assembly includes an extruded welding collar having an interior surface fabricated to closely receive the inserted pipe sections. A welding sleeve comprising a pair of spaced apart sections is received within collar recesses dimensioned to place the sleeve in flush relationship with the collar interior and immediately adjacent the pipe sections. The welding sleeve sections are located on opposite sides of the pipe ends to isolate the pipe ends from their heating effect, and the connecting lead between the sections is recessed for the same reason. The close fit of the collar and sleeve sections with the pipe sections enables development of internal bonding pressures sufficient to constrain the wire turns of the sleeve sections against thermal drift, and to produce a fusion bond of adequate depth and continuity.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: March 6, 1990
    Assignee: R. W. Lyall & Company, Inc.
    Inventor: Donald C. Hill
  • Patent number: 4900118
    Abstract: Opposed ones of optical fibers respectively secured in a plurality of guide grooves formed in first and second blocks, are jointed to each other through an optical film formed on at least one of their opposed inclined end faces in such a way that their optical axes are aligned with each other. Further, each of optical fibers similarly disposed on a third block is formed at its one end face with a total reflection film and is arranged in parallel to the optical fibers of the first and second blocks in such a way that an optical signal incident to the respective fibers of the first block is propagated through the splitting films and total reflection films along optical axes of the associated optical fibers of the third block.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: February 13, 1990
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Hisaharu Yanagawa, Hirokazu Hayakawa, Mikio Ogai, Toshihiro Ochiai, Hidehisa Miyazawa
  • Patent number: 4897138
    Abstract: A plastic tube is sealed at its end by placing the tube in a pair of spaced apart tube holders having tube receiving pockets. The tube is cut by a cutting device movable into and out of the space between the pockets to form two distinct tube sections which are melted at their ends while in the clamped condition. The cut ends are then brought into contact with each other in a mis-aligned condition offset by one-half the thickness of a tube wall to seal the tube end.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: January 30, 1990
    Assignee: Denco, Inc.
    Inventors: John B. Shaposka, Dudley Spencer
  • Patent number: 4865674
    Abstract: A method of connecting two thermoplastic pipes and joint resulting therefrom which includes an electrically conductive insert sleeve with radially extending barbs alternately projecting to the inside and outside diameter of the sleeve into the adjacent fused plastic to achieve the joint.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: September 12, 1989
    Assignee: Elkhart Products Corporation
    Inventor: Robert J. Durkin
  • Patent number: 4863541
    Abstract: Long lengths of a heat-shrinkable sleeve for use in splicing electrical cables and the like are manufactured by providing an elongated impermeable core having a smooth outer surface, extruding an elongated sleeve around and in contact with the core, the sleeve having a smooth inner surface conforming to the outer surface of the core, and effecting an initial expansion of a portion of the sleeve to a larger diameter in an expansion zone so that the sleeve separates from the core and leaves a space between the sleeve and core. A fluid is introduced into the space under pressure via a fitting at the downstream end of the sleeve while continuously advancing the sleeve and core through the expansion zone. To begin the process, a permeable core is used, and the sleeve is extruded around and in contact with the permeable core.
    Type: Grant
    Filed: August 28, 1984
    Date of Patent: September 5, 1989
    Assignee: Cable Technology Laboratories, Inc.
    Inventors: Carlos Katz, Attila Dima
  • Patent number: 4851647
    Abstract: In order to weld butt-jointed plastic tubes, a welding element with a wire coil for electrical resistance heating is positioned between the abutting tube ends. The tube ends are pressed to each other while at the same time the welding device is heated to welding temperature. Lastly, the tube ends are held together until the welded area has hardened by cooling. The welding device is constructed in the form of an annular disc the external diameter of which is approximately equal to the external diameter of the tubes and the internal diameter of which is approximately equal to the nominal internal diameter of the tubes. A heating wire coil spirals around the geometric center of the annular disc, and is positioned on the two annular disc surfaces that come into contact with the tube ends.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: July 25, 1989
    Assignee: Firma Riesselmann & Sohn
    Inventor: Siegfried Kuhling
  • Patent number: 4844573
    Abstract: An electro-optical converter has at least three optical or electrical ports at least one of which is optical and one of which is electrical. The converter includes an essentially rigid support, a fiber-optic lateral coupler secured to the support including at least two length-wise continuous optical fibers juxtaposed along a portion of their length to provide lateral transfer of optical energy therebetween, and an electro-optical device also secured to the support in close relationship to the coupler. The device has at least one optical port and at least one electrical port. One of the coupler fibers communicates within the converter with the optical port of the electro-optical device, to serve as an internal signal link therebetween. The length of the link between coupler and electro-optical device is of the order of 10 centimeters or less. Protective means associated with the optical fibers, the electro-optical device and the internal link serve to protect the components from outside physical disturbance.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: July 4, 1989
    Assignee: Aster Corporation
    Inventors: Frederick J. Gillham, David W. Stowe
  • Patent number: 4842438
    Abstract: Method for joining thermoplastic cores having spaced, longitudinal surface grooves for receiving optical fibers or electrical wires. A heat shrinkable plastic sleeve is applied over the end of one of the cores. A piece of a core selected so that the ends of the grooves match, at each end, the grooves of the cores to be joined, is inserted between the ends of the cores in abutting relation with the cores, and malleable metal elements, longer than the piece and having the cross-sectional shape of the grooves are inserted in the grooves of the piece with the ends thereof in the grooves of the cores. The sleeve is slid over the elements-piece assembly and heated so that it shrinks therearound, so that the plastic of the piece and the cores is softened and the grooves conform to the shape of and embed the elements and so that the ends of the piece fuse with the ends of the cores.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: June 27, 1989
    Inventors: Bruno Bortolin, Enrico Dotti
  • Patent number: 4832773
    Abstract: Thermoplastic tubes are welded together in a dry condition with the tubes being open and maintained in their undistorted condition during the welding step. In an alternative technique a branch tube is welded to a main tube by placing the tubes in a non-parallel orientation in a holding device. A wafer cuts completely through one tube to form two tube sections. The wafer also cuts a notch from the other tube. One of the tube sections is shifted to become aligned with the notched other tube and welded thereto. A further technique includes placing at least one tube in a holding device which has a false floor for pressing against an area of the tube while the tube is being flattened at two spaced locations on opposite sides of the area. When the false floor is moved away from the tube a partial vacuum results. An air pocket is formed when the tube is severed by a wafer by air flowing into the cut tube.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: May 23, 1989
    Assignee: DENCO, Inc.
    Inventors: John B. Shaposka, Dudley W. C. Spencer
  • Patent number: 4826549
    Abstract: A method of processing spliced filamentary materials within which the filamentary material is spliced with a hardenable friable, splicing material, the filamentary material then being processed to break the friable splice.
    Type: Grant
    Filed: April 30, 1984
    Date of Patent: May 2, 1989
    Assignee: Owens-Corning Fiberglas Corporation
    Inventors: Jean-Claude Pollet, Joseph Yu
  • Patent number: 4803762
    Abstract: A method and apparatus are disclosed for splicing lengths of synthetic fiber tow. The tail of one length of tow and the lead portion of another length are each separated into an equal number of bundles. Bundles from the lead portion are overlapped with bundles from the tail portion to form overlapped pairs of bundles, which pairs are confined in a pair of separate, spaced-apart, open-ended passageways. Then, the overlapped pairs in each of the pairs of passageways are subjected to a plurality of longitudinally spaced-apart jets of gaseous fluid oriented generally perpendicular to the length of the overlapped pairs. This causes fibers in the pairs of bundles from the lead portion and the tail portion to become entangled to form a splice between the lengths of full tow. With certain tows it is preferred that the direction of the jets in one of the passageways of each of the pairs of passageways is opposed to the direction of the jets in the other passageway of each of the pairs of passageways.
    Type: Grant
    Filed: February 26, 1988
    Date of Patent: February 14, 1989
    Assignee: World Tech Fibres, Inc.
    Inventor: Richard W. Sheehan
  • Patent number: 4801349
    Abstract: The invention is a method and apparatus for butt-welding two adjoining plastic tubular members which are held in axially adjustable mountings and which are joined together under axial pressure after heating in the area of their juncture by means of electric heating elements. Welding without formation of an interior bead is made possible with the invention by inserting into the plastic tubular members, prior to heating, a bolster which bridges the juncture and fits flush against the inside curvature of the plastic tubular members, and by applying in the area of the juncture shell-shaped heating elements to the outside of the plastic tubular members to heat the abutting ends of the plastic tubular members from the outside.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: January 31, 1989
    Inventors: Armin Dommer, Dieter Dommer
  • Patent number: 4798641
    Abstract: A lightguide fiber (16), having predetermined losses, is fabricated from individual pieces (26) of fiber which are selected from an inventory thereof such that the median loss per unit length of pieces remains substantially the same after fiber fabrication. To fabricate the fiber, the inventory is first divided into a plurality of classes based on the following criteria: (1) whether each piece has a length above or below the average length of the pieces within the inventory. (2) whether each piece has a median loss per unit length above or below the median loss per unit length of the fiber to be fabricated, and (3) whether each piece has a variation in loss above or below a preselected value. Thereafter, the classes are successively examined, beginning with the first one, to determine whether any piece therein has transmission characteristics suitable for fabricating the fiber. If so, the piece is selected from the class.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: January 17, 1989
    Assignee: American Telephone and Telegraph Company
    Inventors: Michael R. Murr, Jay R. Rajasekera, Bruce C. Vrieland
  • Patent number: 4796975
    Abstract: A method of aligning and attaching optical fibers to substrate optical waveguides is disclosed. In accordance with the method, one or more slabs of preferentially etchable material and a waveguide substrate are placed adjacent each other face down on a flat surface for aligning the tops of the slabs with the top of the waveguide. A backing plate is secured to the back surface to hold the entire assembly together. The preferentially etchable material is thereafter etched to form v-grooves in alignment with the light guiding region of the waveguide substrate. Thereafter, optical fibers are secured thereto in an optically aligned manner with the light guiding region. In another aspect, the invention is directed to a fiber pigtailed waveguide substrate manufactured in accordance with the method.
    Type: Grant
    Filed: May 14, 1987
    Date of Patent: January 10, 1989
    Assignee: Amphenol Corporation
    Inventors: Gregory J. Lukas, Kevin L. Sweeney, Michael R. Keur
  • Patent number: 4793880
    Abstract: A linear welding process and apparatus connects fluid-filled tubes in a sterile manner. The linear welder includes a base on which a carriage is slidably mounted. A pair of side by side arms are secured to the carriage as are a pair of tube holders. A pair of clamping jaws are mounted on the arms to clamp a pair of tubes in the holders. The arms are movable for passing the clamped tubes into contact with a heated wafer which cuts the tubes into tube sections. The tube sections are realigned and a pair of sections are butt welded together.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: December 27, 1988
    Assignee: Denco, Inc.
    Inventors: John B. Shaposka, Dudley W. C. Spencer
  • Patent number: 4786139
    Abstract: Light transfer apparatus and method and apparatus for making disclosed includes a screen row clamping assembly that clamps a row of screen units side by side in a straight row with uniform spacing of fiber ribbons between units. A matrix row clamping assembly clamps a row of matrix units side by side in a straight row with uniform spacing of fiber ribbons between units. A pair of alignment rods connect screen units side by side and also connect to alignment ribs on the back of the screen units that interfit end to end and are joined by connecting channels. The alignment rods fasten to terminator bars secured to a screen frame and the ribs are also secured to the screen frame. The rows of matrix units are placed in a matrix frame in which they are held together in a square configuration with uniform spacing between and alignment of fiber ribbons. The matrix ends are cut to a planar surface by a band saw.
    Type: Grant
    Filed: November 19, 1987
    Date of Patent: November 22, 1988
    Assignee: Advance Display Technologies, Inc.
    Inventor: Steven R. Sedlmayr
  • Patent number: 4770490
    Abstract: Tape reinforced by means of filaments comprising a backing and a plurality of yarns comprising a multiplicity of filaments adhered to at least one major surface of said backing by means of a layer of an adhesive. The yarns are disposed essentially parallel to each other along the machine direction of the tape. The yarn-bearing surface of the backing is coated with a polymeric material that both overcoats the filaments and detackifies the residual adhesive between the yarns. The yarns are preferably elliptical in cross-section, with the major axis thereof being essentially parallel to the plane of said backing. In a second embodiment, the tape is reinforced by individual filaments adhered to the backing by means of a layer of adhesive.One advantage of the tape of this invention is that the polymeric material makes it possible for the tape to be applied to optical fiber cable from conventional apparatus without having adhesive from the tape stick to the apparatus.
    Type: Grant
    Filed: August 7, 1986
    Date of Patent: September 13, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Larry E. Gruenewald, Donald J. Klassen
  • Patent number: 4767174
    Abstract: A process and device for connecting an optical fibre and an integrated optical component comprising a wave guide. The fibre and the component each have an end adapted for connection. The component is attached to a main support. The fibre is attached to a fibre support so that the end of the fibre extends beyond such fibre support. The end of the fibre is attached to the end of the component so as to allow light to pass from the fibre to the component and conversely. Then the fibre support and the main support are rigidly connected to each other.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: August 30, 1988
    Assignee: L'Etat Francais represente par le Ministre des P.TT.
    Inventors: Alain Carenco, Luc Riviere
  • Patent number: 4763983
    Abstract: An optical transmission cable with messenger being of an all-dielectric construction particularly suitable for use in aerial optical communication applications and comprising a figure-eight optical transmission cable with a messenger having a fiber reinforced plastic rod bonded to a polyethylene jacket with an adhesive layer of ethylene acrylic acid in order to prevent relative movement between the messenger rod and the polyethylene jacket.
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: August 16, 1988
    Assignee: Sumitomo Electric Research Triangle, Inc.
    Inventor: P. Stephen Keith
  • Patent number: 4762580
    Abstract: A circularly symmetric reinstatement sheathed optical fibre splice butt joining the ends of two acrylate sheathed glass optical fibres is made by a method that includes the step of immersing the spliced fibres (14) in dichloromethane (64) to cause the acrylate to swell and longitudinally expand to close the gap (42) in the sheathing (41) left by the splicing process. The sheathing is clamped in this position while the solvent evaporates. The residual gap, which is comparable in length with the sheath diameter, is protected by the application of a drop of uncured resin which capillary forces constrain to assume a circularly symmetric form until the resin is cured.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: August 9, 1988
    Assignee: STC PLC
    Inventor: Alexander J. Robertson
  • Patent number: 4755244
    Abstract: This invention relates to a method of forming a fire resistant seal from a tubular ring of elastomeric material having a garter spring movably mounted in the bore of the seal.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: July 5, 1988
    Assignee: General Connectors Corporation
    Inventor: Robert S. Allison
  • Patent number: 4753697
    Abstract: A process and system is provided for making a connection between two fluid-filled plastic tubes that ensures total containment of potentially dangerous fluids and maintaining sterility of the connection. The tubes are folded to remove all fluid from the weld site and positioned to cause the connection to take place in this fluid free zone. Each folded section is first cauterized to create a bacteria free zone, the tubes are slit in the zone, and cauterized a second time to insure sterility and melt the tube ends. The tubes are urged together and as the thermoplastic resin cools, a totally contained, sterile weld is formed.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: June 28, 1988
    Assignee: Denco, Inc.
    Inventors: John B. Shaposka, Dudley W. C. Spencer
  • Patent number: 4737214
    Abstract: A process and apparatus for sterile docking of plastic tubes or the like is disclosed in which the tube ends to be joined are sealed by a transverse weld seam and aligned along a common axis. A heating unit is moved between the tube ends at a distance thereto to melt the latter. After retracting the heating unit, the tube ends are urged together. Prior to and during the heating, the tube ends are squeezed behind the weld seam. Immediately after contacting together the tube ends, the squeezing action is discontinued to provide a sterile docking and an opening of the sealed ends.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: April 12, 1988
    Assignee: NPBI Nederlands Produktielaboratorium voor Bloedtransfusieapparatuur en Infusievloeistoffen B. V.
    Inventors: Hendrik J. Leurink, Andries C. J. Kuivenhoven
  • Patent number: 4737220
    Abstract: A hollow, flexible, bendable, cylindrical-shaped, hat-like sleeve is water-tightly joined with the upper end of the riser section of a manhole structure. The free end of the sleeve is trimmed so that its upper edge fits beneath the shoulder of the frame supporting the manhole cover to prevent subsurface water from entering into the manhole interior through the regions between the manhole cover supporting frame and the top of the riser section, which is usually fitted with adjustment rings to bring the manhole cover frame up to grade. The sleeve is easily cut to any height to accommodate either a greater or lesser number of height adjustment rings. The sleeve flange is cast into the riser section. The sleeve may be folded into itself to significantly lower its profile to expedite handling, transportation and assembly. A plastic clamping band may be placed into the interior of the sleeve to water-tightly join the upper end of the sleeve to the manhole cover support frame.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: April 12, 1988
    Assignee: A-Lok Products, Inc.
    Inventors: Jack Ditcher, Eric Ditcher, James A. Westhoff
  • Patent number: 4736775
    Abstract: A spliced casing and method wherein two pressure sensitive adhesive tapes are used to join the ends of cellulosic casing. A first tape adheres directly to the casing. A second tape, which is wider than the first tape, is wrapped about the first tape so lateral side margins of the second tape overlap the opposite side edges of the first tape and are adhered directly to the casing.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: April 12, 1988
    Assignee: Viskase Corporation
    Inventor: Jeffery A. Oxley
  • Patent number: 4733930
    Abstract: To a carrier (1, 1') there is cemented a bar of a material (3, 3'), for example glass or a ceramic material, which is subsequently divided, using cuts (7, 7') which extend transversely of its longitudinal direction, into a number of slices (9, 9') which are separately cemented to the carrier. Each slice (9, 9') is provided with a groove (13, 13') which extends parallel to the cuts (7, 7'). The grooves (13, 13') are curved and have a center of curvature which is situated at the side of the bar (3, 3') which faces the carrier (1, 1'). In the grooves (13, 13') there are secured optical fibres (19, 19') which follow the curvature of the groove, after which a side portion of the fibres which is situated furthest from the carrier (1, 1') is ground off. A flat ground face (21, 21') is thus formed one each fibre (19, 19'). Such ground fibres (19, 19') are arranged so that their ground faces contact one another in order to form directional couplers, after which the slices (9, 9') are detached from the carrier (1, 1').
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: March 29, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Petrus J. W. Severin, Adrianus P. Severijns, Johannes A. M. Steenbakkers
  • Patent number: 4714513
    Abstract: Apparatus for use in fushion welding joints in a plastic pipe system comprising a heating device including a housing providing a rearwardly disposed pistol grip handle, a heating member secured in heat insulating relation to the housing in a forwardly extending position with respect to the pistol grip handle, a secondary handle structure detachably fixedly secured to a side of the housing at one end thereof and extending outwardly therefrom having an adjustable depth gauge on the outer end thereof for receiving the end of a plastic pipe and determining the depth to which the pipe end should be heated to fushion weld the same into a mating socket of a plastic fitting, a clamping device operable to be clamped in rounding engagement with the exterior periphery of the plastic pipe at a position inwardly of the depth thereof determined by the depth gauge, heatable socket and plug members detachably fixedly secured to the heating member for receiving in heat conducting relation a plastic pipe end and a mating socke
    Type: Grant
    Filed: April 9, 1984
    Date of Patent: December 22, 1987
    Inventor: Roy E. McAlister
  • Patent number: 4707201
    Abstract: A process for the production of polished block single mode, evanescent wave directional optical couplers. The process comprises producing a plurality of discrete coupler halves, each coupler half having an optical fiber imbedded in a substrate. The coupler halves are then ground to remove a small portion of the cladding of the optical fiber to produce an oval shaped area of defined dimensions of the exposed fiber. The ground coupler halves are mounted in a first holder in a coplaner manner and further worked to a end point determined by an evanescent coupling measurement. A pair of coupler halves are secured together such that the optical fibers are in optical contact and in effective fusion with each other.
    Type: Grant
    Filed: August 20, 1986
    Date of Patent: November 17, 1987
    Assignee: Canadian Instrumentation and Research Limited
    Inventor: Michael Failes
  • Patent number: 4691987
    Abstract: In a flexible, fiber optic belt 16 for the coherent transmission of light from an LED light source 22 a planar array of fiber optic filaments 34 extend along the length of the belt 16 and are positioned by transverse elements 79 along the major neutral plane of the belt. The fiber optic belt 16 is restrained to movement only in the direction normal to the major neutral plane by means of one or more rigid flat strips 25 parallel to the major neutral plane and the light source 22 is thermoelectrically cooled to improve the availability of light supplied by the diodes. In a method for producing the fiber optic cable, transverse positioning elements 79 are layered on a cable mold 56, one or more fiber optic filaments 34 are placed upon the transverse positioning elements 79. Fiber optic filaments 34 are pressed onto an adhesive layer adjacent to the LED's 48 and bonded by the melting of the adhesive.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: September 8, 1987
    Assignee: Itek Graphix Corp.
    Inventors: Peter R. Ebner, Emanual C. Ebner, Jr., John H. Shaw, John G. Miller, Donald E. Gorelick
  • Patent number: 4684417
    Abstract: Two tubes of thermo-plastic material are joined by a sleeve in an inner portion of which there is an electrical resistance coil, the ends of which are connected to terminals projecting from the outer surface of the sleeve. An electrical circuit supplies electric current to the coil to heat an inner weld zone to welding temperature, while leaving enveloping outer portions at lower temperature. In the sleeve there is provided a radial hole or recess into which the heated material expands upon reaching welding temperature. The material expanding into the hole or recess when welding temperature is reached is sensed by a pressure responsive micro-switch or electro-optically by an optical transmitter and receiver and through a control circuit, shuts off the power to the resistance coil. The parts being thereby fused together, are allowed to cool to complete the weld.
    Type: Grant
    Filed: September 25, 1986
    Date of Patent: August 4, 1987
    Assignee: Societte Anonyme Nomegasgne Toutlectric
    Inventor: Gerard Grandclement
  • Patent number: 4666541
    Abstract: A process for making a fiber optic coupler. An optical fiber reception block of rigid material that has orthogonal longitudinal and transversal planes of symmetry, an arcuate fiber receiving groove extending along the longitudinal plane of symmetry, and a plurality of reference surfaces is provided. An optical fiber is glued into the groove and the block is cut along a plane perpendicular to the longitudinal and transversal planes of symmetry to remove part of the fiber. The block is then cut in half along the transversal plane of symmetry, the two halves are superimposed in inverted positions and aligned by using a reference surface. This process forms a multibranch coupler that finds numerous applications in telecommunication systems.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: May 19, 1987
    Inventors: Georges Le Noane, Daniel Boscher, Rene Lemarer
  • Patent number: 4664732
    Abstract: Methods, apparatus and articles for systems comprising optical fibers, in particular for feeding an optical signal into an optical fiber through the buffer thereof and for withdrawing an optical signal from an optical fiber through the buffer thereof. Preferably this is achieved with the aid of an optical coupling means which contacts and conforms to the surface of the buffer at a bent portion of the fiber. The coupling means can for example be a resiliently deformable material such as a polysiloxane. In a preferred aspect, the invention provides an apparatus and method for axially aligning, and preferably joining, the ends of optical fibers. The apparatus comprises means for holding two fibers so that the fiber ends are approximately abutting and axially aligned, adjacent means for passing an optical signal into one of the fibers through the buffer thereof, and adjacent means for withdrawing that signal from the other fiber through the buffer thereof.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: May 12, 1987
    Assignee: Raychem Corp.
    Inventors: Bruce D. Campbell, James T. Triplett, Richard E. Tylor
  • Patent number: 4662962
    Abstract: A support of soft material (4) has a fiber-receiving groove (5) in one of its surfaces (40). The groove is filled with a transparent setable liquid medium. A rigid link part (8) is pressed against the groove. Suitably prepared ends (11, 21) of two optical fibers (1,2) are inserted into the liquid-filled groove from opposite ends thereof. The medium is caused to set, and then the link part (8) is removed from the support. The optical fibers come away with the link part and the support mold is reusable. In a variant, the link part is stretched prior to gluing, and is allowed to return to its original length after the glue has set. This prestresses in the connection.
    Type: Grant
    Filed: August 1, 1984
    Date of Patent: May 5, 1987
    Assignee: Alliance Technique Industrielle
    Inventor: Francois-Louis Malavieille