With Spiral Seam Patents (Class 138/150)
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Patent number: 4862924Abstract: A flexible hard pipe in which over a soft inner pipe wall a hard belt-like member is helically wound. The belt-like member has a double-hook shape in which a flat inner surface is fused to the inner pipe wall. A raised hook portion overlaps a hook portion of the fused portion of a neighboring wrap.Type: GrantFiled: March 8, 1989Date of Patent: September 5, 1989Inventor: Shiro Kanao
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Patent number: 4823847Abstract: A method for production of a multi-layer gap-less steel pipe. An inner pipe and an outer pipe are formed from thermomechanically rolled steel strip with high notched bar impact strength by welding. The individual helical welding seam steel pipes of about the same lengths are matched with a difference of less than about one percent between the outer diameter of the inner pipe and the inner diameter of the outer pipe. The matched inner pipe is inserted into the outer pipe and the pipes are mechanically expanded with diameter control to a preset outer diameter of the multi-layer steel pipe. The resulting multi-layer steel pipe has the inner pipe disposed under compression and the outer pipe layer disposed under stress. The presence of a compression stress in the inner pipe provides a means opposed to hydrogen sulfide stress corrosion.Type: GrantFiled: September 10, 1982Date of Patent: April 25, 1989Assignee: Hoesch Werke AGInventors: Heinz Grosse, Friedrich-Otto Koch, Adolf Peeck, Werner Wennemann
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Patent number: 4796672Abstract: An improved pressure-withstanding pipe is made of a soft synthetic resin or rubber material with hard synthetic resin reinforcing bodies helically wound and embedded in the pipe wall at predetermined intervals. A thin reinforcing belt member is also helically wound and embedded in the pipe wall and the opposite side end portions of the belt are anchored in adjacent ones of the rigid reinforcing bodies. The method of manufacturing a pipe according to the invention includes a step of extruding the pipe forming body by feeding rigid synthetic reinforcing material and soft synthetic material to the extruder and, at the same time, passing the thin reinforcing belt member therethrough. The resultant pipe according to the invention is highly resistant to extension and other deformation due to pressure exerted from the material being transported as well as highly resistant to external pressure and deformation from such pressure.Type: GrantFiled: August 13, 1986Date of Patent: January 10, 1989Inventor: Shiro Kanao
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Patent number: 4688319Abstract: A method for production of a multi-layer gap-less steel pipe. An inner pipe and an outer pipe are formed from thermomechanically rolled steel strip with high notched bar impact strength by welding. The individual helical welding seam steel pipes of about the same lengths are matched with a difference of less than about one percent between the outer diameter of the inner pipe and the inner diameter of the outer pipe. The matched inner pipe is inserted into the outer pipe and the pipes are mechanically expanded with diameter control to a preset outer diameter of the multi-layer steel pipe. The resulting multi-layer steel pipe has the inner pipe disposed under compression and the outer pipe layer disposed under stress. The presence of a compression stress in the inner pipe provides a means opposed to hydrogen sulfide stress corrosion.Type: GrantFiled: September 20, 1984Date of Patent: August 25, 1987Inventors: Heinz Gross, Friedrich-Otto Koch, Adolf Peeck, Werner Wennemann
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Patent number: 4682632Abstract: A short steel pipe for use as a crack stopper is described having externally or internally helically arranged individual notches, perforations or texture changes at such a number that they overlap in axial direction, and an axial line on or in the pipe will traverse at least one of these notches, perforations or texture changes.Type: GrantFiled: October 4, 1985Date of Patent: July 28, 1987Assignee: Mannesmann AGInventors: Wolfgang Wiedenhoff, Adolf W. Gaertner, Gert Vogt, Claus Weisgerber
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Patent number: 4645553Abstract: Process for manufacturing a calibrated cardboard tube having minimal surface roughness and dimensional stability, involving helically winding a plurality of glued strips or plies around a mandrel and then polishing the exterior surface of the rough tube, coating the exterior surface with a thermosetting resin, cutting the tube, drying and compressing the cut pieces transversely together with applying heat, wherein at least the next-to-last ply and the last ply or strips of a dense material are impregnated with a thermosetting resin and, after coating and heat compression of the pieces, a final coating of a thermosetting resin is applied to the last plies before drying the coated surface and buffing or finish polishing to form a smooth surface, and the apparatus for performing the process.Type: GrantFiled: May 31, 1985Date of Patent: February 24, 1987Assignee: L'Homme, S.A.Inventor: Jean-Paul Languillat
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Patent number: 4590108Abstract: An insulating system for fluid conduit pipes and the method of insulating is disclosed. An inner layer of resilient flexible insulating material is wrapped about the outer surface of the conduit pipe. An outer layer of flexible cohesive material which is moisture and vapor impervious is wrapped about the inner layer of insulating material. The cohesive material is wrapped so that portions of adjacent edges overlap to self seal by forming a cohesive seal therebetween. Preferably the wrapping of the outer cohesive material is conducted so as to partially compress the inner resilient insulating layer both circumferentially and radically. The resiliency of the insulating material presses against the cohesive seal and thereby maximizes the cohesive seal and cooperates in holding the insulating system about the conduit pipe. The inner insulating layer and outer cohesive moisture and vapor barrier layer can be easily and concurrently applied by a single operator.Type: GrantFiled: July 11, 1984Date of Patent: May 20, 1986Inventor: Reynold B. Nippe
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Patent number: 4509447Abstract: A double-wall structural vessel includes an inner tubular liner and an outer tubular shell surrounding the liner in spaced relation, both the liner and the shell comprising helically curved strips of material, and a continuous and helically curved spacer/stiffener therebetween. The liner and shell are relatively shifted axially such that the shell edges are out of alignment with the liner edges, and the spacer spans contiguous edges at successive turns of the liner as well as at successive turns of the shell, and is secured to the strips as well as to the liner edges and to the shell edges.Type: GrantFiled: June 28, 1983Date of Patent: April 9, 1985Assignee: Universal Spiralweld Enterprises, Inc.Inventor: Richard H. Smith, Sr.
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Patent number: 4487232Abstract: A double-walled corrugated synthetic resin pipe comprises a straight inner pipe, and a corrugated outer pipe surrounding the inner pipe, and joined integrally thereto. The inner pipe is formed by a spirally wound flat strip of a synthetic resin having adjoining turns joined to each other along their adjoining edges, and has a generally even outer surface. The outer pipe is formed by a spirally wound corrugated synthetic resin strip also having adjoining turns thereof joined to each other along their adjoining edges. The outer pipe has a corrugation defined by a ridge portion, a groove portion, and an intermediate portion, and the groove portion has an inner surface joined to the outer surface of the inner pipe.Type: GrantFiled: June 21, 1982Date of Patent: December 11, 1984Inventor: Shiro Kanao
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Patent number: 4481978Abstract: A typical embodiment of the invention produces helically wound tubes from strips of thin plate in which adjacent edges are provided with interlocking ribs that are folded over to form a compressed bead. A further rib is formed at the bead, the bead providing one of the sides of the new-formed rib.Type: GrantFiled: July 3, 1979Date of Patent: November 13, 1984Assignee: Westaflex-Werk L.U.F. Westerbarkey GmbH & Co.Inventor: Manuel Escandell
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Patent number: 4478252Abstract: A device for enclosing elongate objects comprises a dimensionally-recoverable cover which can be wrapped-around the object and closed by means of closure elements located on the cover. The closure elements are preferably in the form of a row of protuberances spaced apart along the edge portions of the cover the protuberances of one edge portion being nestable within the protuberances of the other edge portion. The protuberances are preferably provided with retaining elements which lock the nested protuberances together and will accommodate relative movement between adjacent pairs of nested protuberances to allow the device to be recovered onto objects of varying dimensions.Type: GrantFiled: January 28, 1982Date of Patent: October 23, 1984Assignee: Raychem Ltd.Inventor: Robert H. McLoughlin
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Patent number: 4459169Abstract: A rotatable processing bowl assembly adapted for mounting in a centrifuge includes an umbilical tubing system formed of a plurality of individual flexible tubes each of which communicates with the processing bowl. Each tube has an exterior wall and includes a first portion extending adjacently from the bowl and a second portion which is spaced from the bowl. The exterior walls of the tubes are bonded together along their first portions so that the joined exterior walls collectively define the outer periphery of the tubing system along the first portions of the tubes. Preferably, the tubes are also wound to form a predetermined helical pattern along their first portions. This arrangement enhances the tubing system's durability and resistance to fatigue along the bonded together first portions, particularly at higher rotational speeds, and permits direct, facile connection of the free and unattached second portions with external apparatus.Type: GrantFiled: March 23, 1983Date of Patent: July 10, 1984Assignee: Baxter Travenol Laboratories, Inc.Inventors: David V. Bacehowski, Ronald Bucheger
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Patent number: 4457068Abstract: A method of wrapping a cylindrical shape uses an elongated sheet material with a first fastener portion extending along one edge and one face of the material and a second fastener portion extending along the opposite edge and opposite face of the material. The material is helically wrapped about the cylindrical shape with the edges overlapped and the first fastener portion continuously contacting and releasably attached to the second adhesive portion to secure the sheet material to the cylindrical shape.Type: GrantFiled: December 17, 1981Date of Patent: July 3, 1984Inventor: Leo A. Maier, Jr.
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Patent number: 4450872Abstract: A lightweight ceramic refractory covering for water cooled members forming the structural portion of a metallurgical furnace which is thermally insulating and resists wet scale attack, corrosion and vibrational stresses. The covering comprise an inner layer of thermal insulating ceramic refractory fiber blanket, an open weave ceramic cloth about the blanket, an inner layer of veneering mortar, compressed rings or strips of ceramic fiber material, and a hot face layer of veneering coating.Type: GrantFiled: June 18, 1982Date of Patent: May 29, 1984Assignee: The Babcock & Wilcox CompanyInventor: Donald R. Orcutt
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Patent number: 4437495Abstract: A weight-coated pipe has an innermost anti-corrosion layer, a helically-wound covering of a cementitious sheeting having a reinforcement of organic fibrillated film network arranged as a plurality of superposed layers. This covering is applied in a post-cracked condition so that constituent parts of the next layer of concrete penetrate the micro-cracks and form a good bond. An outer layer of helically-wound sheeting similar to the first-mentioned covering serves to protect the weight-coating of concrete from impact damage.Type: GrantFiled: September 15, 1981Date of Patent: March 20, 1984Assignee: University of SurreyInventor: Johannes J. Zonsveld
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Patent number: 4364418Abstract: A flexible conduit with a quadrangular hollow casing-shaped wire in the side wall of the conduit and extending the length of the conduit. The casing-shaped wire has at one side bent unjoined and overlapping extremities of the metal strip from which the wire is formed and is capable of receiving a hydraulic or electrical control line therein.Type: GrantFiled: April 6, 1979Date of Patent: December 21, 1982Assignee: CoflexipInventors: Maurice Genini, Christian Athe, Jean-Paul Aubert
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Patent number: 4344462Abstract: A flexible conduit has an undulating liquid tight inner tube portion and layers of metal reinforcing wound around the tube. The layers include a burst resisting layer adjacent the tube, then traction and pressure resisting layers, and an outer sheath. The undulations in the interior of the tube can be filled with packing or the tube can be lined with a spiral strip to lessen resistance to fluid flow through the conduit.Type: GrantFiled: May 23, 1980Date of Patent: August 17, 1982Assignee: COFLEXIPInventors: Jean-Paul Aubert, Maurice Genini
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Patent number: 4336798Abstract: A plastic medical respiratory conduit is provided having a first tubular helical coil conduit communicating with a first source of fluid. The coil conduit is wrapped with a pliable tape to form a second conduit communicating with a second source of fluid. Resilient couplers can be attached to each end of the conduit to form part of a medical ventilator or humidification system, the resulting ventilator or humidification system providing heretofore unavailable advantages.Type: GrantFiled: October 6, 1980Date of Patent: June 29, 1982Assignee: Anthony V. BeranInventor: Anthony V. Beran
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Patent number: 4220181Abstract: A multi-layer, spirally wound tube or pipe product with a substantially smooth inner wall having a single, helical corrugation and a corrugated exterior wall. The pipe has an inner pipe layer consisting of an elongated sheet of flat material curled into adjacent, helical convolutions and an outer pipe layer consisting of an elongated sheet of corrugated material curled into adjacent, helical convolutions about the inner pipe layer. The inner and outer pipe layers share a common helical seam. A single, continuous helical corrugation is located in the inner pipe layer along the helical seam, thereby causing the seam to be located within the single corrugation.Type: GrantFiled: March 29, 1979Date of Patent: September 2, 1980Inventor: James Nyssen
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Patent number: 4214612Abstract: A composite tubular assembly comprising a membrane for membrane filtration fixed to the inner side of a tube of non woven material, consisting of a wound band of a sealable fibres containing non woven material, which may be helically or non helically wound, consecutive overlapping windings of the band being completely interconnected by ultrasonic heatsealing and thereby forming a smooth inner wall of the tube.Type: GrantFiled: December 3, 1975Date of Patent: July 29, 1980Assignee: Wavin B.V.Inventor: Warren J. de Putter
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Patent number: 4196755Abstract: The reinforced flexible duct consists of a single- or double-ply reinforcing fabric, a wire helix, and a continuous extruded liner. The fabric, wire helix, and extruded liner are continuously helically wound on a mandrel. The freshly extruded liner adheres to itself, to the helically wound wire, and to the reinforcing fabric to form a continuous reinforced flexible duct. Optionally, a narrower continuously extruded and wound scuff strip can be wound over the wire helix.Type: GrantFiled: September 19, 1977Date of Patent: April 8, 1980Assignee: Automation Industries, Inc.Inventors: Thomas A. Kutnyak, Marvin A. Koerber
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Patent number: 4160312Abstract: An apparatus and method for continuously forming multi-layer metal pipe from at least two elongated sheets of metal. One sheet is impressed with longitudinal corrugations in a rolling device and the second sheet, being uncorrugated, is then positioned contiguously upon the first, forming a multi-layer sheet. One or more removable modules is mounted in the rolling device to accurately align and guide the second sheet into position upon the first. Complementary portions of a single corrugation are then formed in the marginal edges of the multi-layer sheet and the sheet is spiralled into adjacent, helical convolutions in a pipe forming device, with the uncorrugated sheet forming the pipe interior. The adjacent convolutions are joined in a helical seam in the single corrugation by a seaming device located in the pipe forming device. In the primary embodiment of the invention, the seam is formed as a double lock seam along a neutral axis of the single corrugation.Type: GrantFiled: January 5, 1978Date of Patent: July 10, 1979Inventor: James Nyssen
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Patent number: 4119122Abstract: A pipe having an outer coating of foam plastics, a tape of thermoplastics being wrapped around the foam plastics in an overlapping way, the overlapping parts being heatsealed to each other. At least one reinforcing filament is present on the original contacting surfaces of the overlaps. Preferably one straight and one zig-zag applied filament are present.Type: GrantFiled: June 16, 1976Date of Patent: October 10, 1978Assignee: Wavin B.V.Inventor: Warner Jan de Putter
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Patent number: 4112565Abstract: A strip-covered roll and the method for manufacturing the same, according to which the roll includes an inner roll body and a plurality of circumferential strip portions surrounding and engaging the inner roll body so as to cover the latter, these circumferential strip portions also engaging each other and being distributed axially along the inner roll body. Each circumferential strip portion has on one side a circumferential groove and on the other side an integral circumferential projection, and the projection of one circumferential strip portion is received in and fills the groove of the next circumferential strip portion, the groove having in its interior a greater transverse dimension than at the side surface of each circumferential strip portion which is formed with the groove, so that in this way the circumferential strip portions are locked to each other.Type: GrantFiled: June 28, 1977Date of Patent: September 12, 1978Assignee: Valmet OyInventor: Vaino Sailas
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Patent number: 4095937Abstract: In a metal reheating furnace, a resilient, vibration resistant and easily installed thermal insulative structure is defined by an inner batt of refractory fibers held in place by an outer wrapping of woven refractory fibers and so arranged as to be self-retaining. This relatively soft, resilient structure supports an outer shell of refractory mortar which adheres to but does not substantially penetrate the woven wrapping, such that vibration and mechanical shock are absorbed in the soft insulation while the exterior layer protects against molten slag and high speed impinging gas flows.Type: GrantFiled: November 8, 1976Date of Patent: June 20, 1978Assignee: HitcoInventors: Steven C. Colburn, Marion H. Black
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Patent number: 4077577Abstract: Non-stressed, high strength, substantially inflexible, rigid, cement-containing pipe, for example, asbestos-cement pipe well adapted as high pressure water pipe, comprising a tubular article body of spirally wound up layers of asbestos-cement, and a plurality of helical windings of a continuous filament of an aromatic polyamide fiber known and obtainable as KEVLAR aramid fiber about one or more of the asbestos-cement layers within the interior of the pipe without being stretched and without being in tension. The aromatic polyamide fiber of the continuous filament is of high tensile strength of about 390,000 psi or higher and a low elongation capability of no more than 7%, and the continuous filament of the belical windings is maintained about the cement-containing composition within the interior of the pipe without being stretched and without being in tension. Non-stressed, high strength concrete pipe is also embodied in the invention.Type: GrantFiled: February 4, 1976Date of Patent: March 7, 1978Assignee: Cement Asbestos Products CompanyInventor: James Wright
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Patent number: 4026690Abstract: A strong, flexible glass fiber carrier and a method of making glass fiber using such a carrier wherein the carrier is of a helically wound forming tube construction for carrying glass fiber thereon in generally circular windings during glass fiber processing, the tube being characterized by having good wet strength and resistance to heat and centrifugal forces. The helically wound tube has a helically wound inner ply having a spiral joint, preferably a spiral butt joint, at least one helically wound intermediate ply having a spiral overlapped joint, a helically wound outer ply having a spiral overlapped joint, and a release coating on the outer ply. The spiral overlapped joint of the outer ply is stacked, or positioned, above the spiral joint of the inner ply to reinforce the latter; the spiral overlapped joint of the intermediate ply(s) is (are) staggered from the other joints of the tube. In the method of making glass fiber, a glass fiber strand is wound around the forming tube and further processed.Type: GrantFiled: June 22, 1976Date of Patent: May 31, 1977Assignee: J.C. Baxter Co.Inventor: Walter L. McClellan
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Patent number: 4010864Abstract: A multilayer pressure vessel comprising a cylindrical portion formed by a pipe with roll strips wound on said pipe and welded to the bottom of the vessel and to its flange for the cover. Said roll strips are wound in layers along a helical line so that each subsequent layer is wound in a direction opposite to the preceding layer at a pitch of 0.2 to 2.2 of the inside diameter of the pipe. The adjacent coils are welded to each other on a helical line only in the roll strip forming the external layer.The multilayer vessel according to the invention is considerably cheaper to manufacture than the known vessels.Type: GrantFiled: April 7, 1976Date of Patent: March 8, 1977Inventors: Pavel Gdalievich Pimshtein, Marat Moiseevich Shel, Enver Rakhmatullovich Khismatulin, Evgeny Grigorievich Borsuk, Alexandr Nikolaevich Novikov, Viktor Matveevich Makarov, Boris Grigorievich Ziselman, Alexandr Valeryanovich Kuramzhin, Viktor Grigorievich Usenko, Nikolai Kirillovich Globin, Vladimir Viktorovich Ivantsov
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Patent number: 3992237Abstract: A foam plastic layer is sprayed onto a metal pipe, whereafter a tape of polyethylene at the extrusion temperature is helically wound around the foam layer.Type: GrantFiled: February 6, 1975Date of Patent: November 16, 1976Assignee: Industriele Onderneming Wavin N.V.Inventors: Willem Gerholt, Gerrit Heidemann
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Patent number: 3990478Abstract: Combined strengthening and corrosion protection of a ferrous metal pipeline is obtained by means of a wrap of ferrous metal strip, the strip being coated with a less noble metal, such as zinc or aluminum or a zinc alloy or an aluminum alloy, and the strip being under sufficient tension to strengthen and reinforce the pipe or to arrest fracture propagation. The less noble metal coating of the strip is electrically connected to the pipe to provide cathodic protection for the pipe. A coating of electrically insulating material may be interposed between the pipe and the wrap. An external power source may be utilized for primary cathodic protection in which case the coated strip is relied upon as a secondary or back-up system.Type: GrantFiled: November 20, 1974Date of Patent: November 9, 1976Assignee: Inland Steel CompanyInventor: William H. McFarland
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Patent number: 3980107Abstract: This application describes a tubular container wall material of particular use in the packaging of dry and liquid products such as hydroscopic food products, and liquid foods. This wall material comprises an inner portion of liner ordinarily composed of four adherent plies of polyester-polyolefin-metal foil-heat seal coating-which liner bonds through the heat seal coating to an outer portion of rigidity-imparting material. This composite wall material constitutes the tubular wall for a container and is formed by winding elongate strips of its constituent plies onto a mandrel where they are bonded into an integral structure, for example, by heating. The can or container itself may then be formed by cutting the resultant tubular structure into appropriate lengths and attaching end closure means thereto.Type: GrantFiled: May 8, 1975Date of Patent: September 14, 1976Assignee: Champion International CorporationInventor: Donald E. Barnes
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Patent number: 3980249Abstract: A high speed yarn carrier or tube comprising a plurality of spirally wound plies of paper and incorporating, beneath the very thin overlapped outer surface defining ply, a strong underply provided with opposed deckle edges overlapped to a width no greater than that of the individual deckel edges. The deckle edge overlap is preferably less than a full overlapping whereby a small sink or depression is formed at the overlap.Type: GrantFiled: May 27, 1975Date of Patent: September 14, 1976Assignee: Sonoco Products CompanyInventors: McCleery B. Cunningham, Clement D. LeHardy
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Patent number: 3951174Abstract: A tubular device for providing a very small passageway suitable for discharging a product and a pressurized material from a container of the aerosol type, wherein the product and the material are disposed, upon opening of a control valve at one end of the tubular device. The tubular device is formed by twisting a plurality of elongate filaments in a rope-like fashion along the lengths thereof to forcefully close the surfaces of the filaments together along the entire length, thereby providing an elongate passageway between the twisted filaments. The exposed surfaces of the twisted filaments are coated with a suitable material for sealing the tube along its entire length.Type: GrantFiled: April 25, 1972Date of Patent: April 20, 1976Inventor: James E. Conant