Patents Examined by Jeffery R. Thurlow
  • Production method for a hollow extrudate
    Patent number: 5433808
    Abstract: In order to achieve a good mounted state by itself without using other members such as spacers or stabilizers, an enlarged section, which is made by enlarging the inner wall of the hollow portion, is provided in the hollow of the hollow portion having the same contour shape throughout the entire length of the hollow extrudate. Thus, the regions such as the corners of the hollow portion are reinforced by said enlarged section to achieve required rigidity, i.e., position-retaining property.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: July 18, 1995
    Assignee: Tokai Kogyo Kabushiki Kaisha
    Inventors: Yukihiko Yada, Tosikazu Ito, Katuyuki Amano
  • Method for the production of a multi-layer construction film
    Patent number: 5433908
    Abstract: A multi-layer construction film is prepared by co-extrusion coating a molten multilayered polymer which satisfies the relationship: 0.08.ltoreq..eta.E/.eta.A.ltoreq.8, which comprises at least one layer (A) of ethylene-vinyl alcohol copolymer and having an ethylene content of 20-60 mol %, and a melt index of .eta.Eg/10 min., and at least one adhesive resin layer (B) of ethylene polymer having a melt index of .eta.Ag/10 min. and a density of not more than 0.9 g/cm.sup.3, onto a plastic film (C) in a manner that layer (B) is laminated adjacent to plastic film (C).
    Type: Grant
    Filed: December 8, 1993
    Date of Patent: July 18, 1995
    Assignee: Kuraray Co., Ltd.
    Inventors: Shigeyuki Harita, Susumu Fukutome, Satoshi Hirofuji
  • Method of manufacturing a heat-resistant resinous tube
    Patent number: 5433913
    Abstract: A method of manufacturing and mass-producing a seamless heat-resistant resinous tube with a uniform tube wall thickness and circumference, which includes the steps of coating the precursor solution of a tube material to the surface of a core at a thickness greater than the tube wall thickness; passing a metallic die having a wider inside diameter than the diameter of the core along the outside of the core by utilizing the resistant force of the precursor solution without restricting the metallic die or the core, thus forming a tube around the core; treating the tube around the core to give it strength as a tube; and separating the tube from the core.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: July 18, 1995
    Assignee: I.S.T. Corporation
    Inventors: Satsuki Kawauchi, Yoji Tani, Hitoshi Fujiwara
  • Polyester monofilaments
    Patent number: 5431999
    Abstract: A process of high-speed spinning of a set of thermoplastic monofilaments having a linear density from 1 to 30 dtex, includes spinning to obtain melt-spun thermoplastic monofilaments and airblast cooling of the melt-spun monofilaments. To produce a particularly fine monofilament at high winding speeds, the process also includes guiding the thermoplastic monofilaments directly over a fork-like friction element having axially parallel, spaced apart upper and lower contacting friction surfaces during the airblast cooling, and then spin finishing and winding up the thermoplastic monofilaments. An apparatus for melt-spinning including the friction element is described. The product monofilament produced by the process can have an elongation of 20 to 45%, a strength of 36 to 60 cN/tex; a boil shrinkage of 2 to 15%; an Uster % less than 1 and a uniformly round cross section.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: July 11, 1995
    Assignee: Rhone-Poulenc Viscosuisse S.A.
    Inventors: Klaus Fischer, Halim Baris
  • Laser beveling process for catheters
    Patent number: 5425903
    Abstract: A process and product and apparatus are disclosed wherein a laser is used to form a conical tapered tip on a catheter product. The catheter is placed on an insertion needle prior to the formation process, thus eliminating the problems associated with wearing out forming tooling. The process and product further call for the use of the laser to create a surface effect on the cannula to indicate the terminus of the catheter.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: June 20, 1995
    Assignee: Critikon, Inc.
    Inventors: Thomas E. Sloane, Jr., Zinovy Altman, Anthony Y. Van Heugten
  • Apparatus and method of forming curved extruded products
    Patent number: 5424023
    Abstract: The present invention has several aspects: an extrusion apparatus, a method of making a curved extrusion, and a curved extrusion made by the method. In broadest terms, the apparatus of the present invention comprises: (1) an extruding means, typically an extruder, adapted to produce an extrudate having a cross-section; (2) a plurality of guide members arranged so as to form a curvilinear path through which the extrusion is passed, each of the guide members having an aperture having substantially the same shape as the cross-section of the extrusion, whereby the plurality of guide members are adapted to form the extrusion into a curved shape while maintaining the cross-section of the extrusion; and (3) mechanical means adapted to conduct the extrusion through said plurality of guide members, such as an extrusion puller.
    Type: Grant
    Filed: June 3, 1993
    Date of Patent: June 13, 1995
    Assignee: Crane Plastics Company Limited Partnership
    Inventors: Bobby D. Riley, William Taylor
  • Variable width die and method for extruding sheet products
    Patent number: 5424018
    Abstract: An apparatus and method for controlling in a variably controllable fashion the width of an extruder die opening whereby the width of material being extruded may be controllably varied.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: June 13, 1995
    Assignee: General Electric Company
    Inventors: William C. Paul, Robert Bourne
  • Process and a device for cooling a pipe during its manufacture by extrusion
    Patent number: 5422063
    Abstract: The invention proposes an improved process and a device for cooling the internal surface of the wall of a pipe made of plastic during its manufacture by extrusion. The cooling agent is dispersed on the internal surface of the pipe by successive atomization at given time intervals. The cooling agent is advantageously dispersed by means of an injection which is displaced axially inside the pipe in a reciprocating movement. The injector may be advantageously equipped with means providing a rotating cone of dispersed droplets.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: June 6, 1995
    Assignee: Kabelwerk Eupen AG
    Inventor: Rudolf Pelzer
  • Die plate for plastics extruder
    Patent number: 5417907
    Abstract: A die plate for use in the extrusion of plastics is provided. Said die plate is capable of preventing or substantially reducing the formation of resin masses at the die face of said die plate by providing an extrusion orafice having an increased diameter in the vicinity of said die face.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: May 23, 1995
    Assignee: General Electric Company
    Inventors: Toshihiro Ohhata, Hidenori Tasaki, Tetsushi Yamaguchi, Makoto Shiina, Masao Fukuda, Hisayoshi Ikeshita
  • Manufacture of composite extrusions
    Patent number: 5415822
    Abstract: A method of forming a composite extrusion is disclosed wherein a main body portion (1) of the extrusion is first extruded from a thermosetting material, this body portion then being heated so as at least partly to cure it, the main body portion then being passed at high temperature through a further extruder where a thermoplastics material (8) is extruded onto one or more surfaces of the main body portion (1), the subsequent composite extrusion then being cooled and formed into its final shape.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: May 16, 1995
    Assignee: Schlegel U.K. Holdings Ltd.
    Inventor: John E. Cook
  • Integral reclosable bag die assembly
    Patent number: 5411692
    Abstract: An integral reclosable bag die assembly for extruding a bag film and a closure profile integrally connected thereto, includes a die including an inlet port for receiving molten polymeric material, an elongated outlet port for discharging the molten material, and a coat hanger plenum extending between the inlet and outlet ports for channeling the molten material from the inlet port to the outlet port. The outlet port includes a pair of elongated lips disposed opposite one another. One of the lips is detachably interlocked to a remaining portion of the die and has a closure profile extrusion site configured in the form of the closure profile. The plenum opens into a diverting channel at an upstream location thereof to divert a portion of the molten material from the plenum into the diverting channel.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: May 2, 1995
    Assignee: Reynolds Consumer Products Inc.
    Inventors: David DiPietro, Mladomir Tomic
  • Method for compounding a polymerized alpha-olefin resin
    Patent number: 5409646
    Abstract: A method for compounding at least one polymerized alpha-olefin resin in an extruder including a screw having a feeding section, a melting section, and a venting section, which method includes: (1) introducing the resin and a heat transfer medium into the feeding section such that the resin is maintained at a temperature below its melting point; (2) transporting the resin and heat transfer medium to the melting section such that the resin is at a temperature which is at or just above its melting point by sublimation or vaporization of the heat transfer medium and kneading the resin at a temperature which is at or just above its melting point; (3) passing a resin melt of step (2) through a melt seal into a venting section wherein the heat transfer medium is released from the extruder; and (4) pumping the resin melt out of the extruder.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: April 25, 1995
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Raghunath G. Menon, Robert J. N. Bernier, Albert L. Legg
  • Method of forming strip products from theremoplastic materials
    Patent number: 5409653
    Abstract: A method of forming an elongated trim strip product by extruding a first strip of thermoplastic material from a die having an outlet with an area at least substantially as great as the desired cross-sectional area of the strip product in planes perpendicular to the direction of extrusion. Immediately subsequent to the step of extruding and while the extruded strip is still in a plastic state, it is passed longitudinally between cooperating forming rolls to shape the cross section of the extruded strip to the desired shape and cross section of the strip product. While the extruded strip is passing between the cooperating forming rolls, a backing strip of foil or thin metal is directed between the rolls in alignment with the extruded strip to bond the backing strip to the extruded strip.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: April 25, 1995
    Assignee: The Standard Products Company
    Inventor: Douglas N. Malm
  • Quaternary ammonium polyarylamides, used to manufacture articles and adhere polyamide objects
    Patent number: 5407626
    Abstract: Quaternary ammonium polyarylamides are provided that are useful in articles of manufacture that require minimal ionic impurities. The polyarylamides are produced by reacting certain polyamides together with quaternary ammonium bases of the formula R.sup.4.sub.4 N.sup.+ X.sup.-, wherein each R.sup.4 is independently selected from hydrocarbyl or substituted hydrocarbyl, provided that at least one of the R.sup.4 groups contains at least one beta hydrogen atom. There is also provided the process for producing the polyarylamides, the process for making articles of manufacture from the polyarylamides, and a process for modifying the surfaces of such polyamides.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: April 18, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert R. Burch, Lewis E. Manring
  • Method and apparatus for processing of raw plastics for reuse
    Patent number: 5407624
    Abstract: A processing line forms a desired end product for a plastic extrusion machine by supplying raw plastic material to a shredder. The shredder forms partially-fused, irregularly-shaped chunks of the raw plastic. The use of the shredder eliminates the requirement of extraneous matter separation prior to feeding of the shredder. The output of the shredder is conveyed to a ram feeder after passing material separators, such as a magnet and/or a metal detector or the like. The ram feeder forces the chunks to an extruder which ultimately supplies liquified plastic to a pelletizer to form pellets. The pellets are transferred to a storage vat for reuse.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: April 18, 1995
    Assignee: North American Plastics Corporation
    Inventors: Harold V. Engh, III, Verlyn Swagger
  • Polyamide monofilament suture
    Patent number: 5405358
    Abstract: A polyamide monofilament suture of reduced energy and/or increased knot security is prepared by extruding a monofilament from polyamide resin, stretching the monofilament and annealing the stretched monofilament.
    Type: Grant
    Filed: August 4, 1993
    Date of Patent: April 11, 1995
    Assignee: United States Surgical Corporation
    Inventors: Cheng-Kung Liu, John C. Brewer
  • Method and apparatus for forming a double walled thermoplastic tube with integral bells
    Patent number: 5405569
    Abstract: A travelling mold tunnel for forming double walled corrugated tube has a first portion for forming corrugated tube and a second belled portion for forming a cuff portion suitable for coupling with another tube. At the upstream end of the belled portion, radial small diameter passages are provided so that a pressure differential may be set up between the inside and the outside of a first parison within the belled portion. Thus, vacuum may be applied through the radial passages to allow an inner parison to laminate with the first parison over its inner surface in the belled portion. The first parison is drawn into the passages in protruding balloons. These may be ruptured. Alternatively, positive pressure may be used. In this case, the balloons may be ruptured inwardly.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: April 11, 1995
    Inventor: Manfred A. A. Lupke
  • Elongated object made of a copolymer of carbon monoxide and an olefinically unsaturated monomer, and method for the production thereof
    Patent number: 5403531
    Abstract: A process for producing an elongated object of an alternating copolymer of carbon monoxide and an olefinically unsaturated monomer wherein the copolymer has an intrinsic viscosity measured in m-cresol at 100.degree. C. of at least 1 dl/g, involve converting a solution of the copolymer into a solvent-containing object, removing between 90 and 99.9% of the solvent from the solvent-containing object, and stretching the thus obtained object at a temperature below the melting point of the copolymer.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: April 4, 1995
    Assignee: DSM N.V.
    Inventor: Hendrikus J. J. Rutten
  • Method and apparatus for molding inflation film
    Patent number: 5403539
    Abstract: A method and apparatus for molding an inflation film even from a thermoplastic resin having a small melt tension, in which a melt resin bubble extruded from an extruder is molded, while controlling a resin temperature of the bubble to a certain temperature range by an air ring provided with a plurality of annular slits for blowing cooling air in a take-up direction of the melt resin bubble and provided at a position at which the melt resin bubble is remarkably expanded, after (a) cooling air is blown to a melt resin bubble from a first air ring provided at the proximity of a die outlet to cool said melt resin bubble; and, then, the bubble is either (i) brought into contact, on the inner surface thereof, with the surface of a stabilizer provided on a die surface, or (ii) is supported in a non-contact state through an air layer, while being taken up.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: April 4, 1995
    Assignee: Showa Denko K.K.
    Inventors: Toshio Taka, Takeshi Onoda, Hisashi Hatano, Tomoaki Kobayashi, Terumitu Kotani
  • Extrusion die and method of controlling flow through the die
    Patent number: 5401454
    Abstract: An extrusion die and flow control method incorporates a flow control in the form of a flow diverter which extends transversely across the flow path. The diverter forms part of a window upstream of the die lips and provides a slight tapering enlargement which may be moved along the window across the flow path from one side to the other or preferably, from the center symmetrically outwardly, or vice versa, to divert flow from the center proportionally to the edges without changing the total cross sectional area of the window. The window is formed by a pair of axially rotatable cylindrical bars recessed in the die body which each have a flat forming the enlargement. In the preferred form the flat is helical. The helical flats are opposed or matched so that as the bars contra-rotate synchronously the enlargement will move across the window.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: March 28, 1995
    Assignee: UC Industries, Inc.
    Inventor: Kilian K. Mendel