Abstract: A nonwoven textile material useful in dissipating static electric charges containing an electrically conductive polytetrafluoroethylene fiber. An amount of a synthetic fiber may be intermixed with the electrically conductive polytetrafluoroethylene fiber to produce the static dissipative textile material. The nonwoven static dissipative textile material may combine with a porous polymeric membrane to form nonwoven fabric laminate.The nonwoven textile material is useful as a filtration media and may be fabricated into a filter bag.
Abstract: A leak detection cable for detecting aqueous based liquids that contain a surfactant is composed of an insulated wire conductor (1 and 2) wrapped with a water resistant yarn (3) and a braided second conductor (4).
Abstract: A waterproof and water-vapor-permeable composite laminated material that has good snag resistance and puncture resistance is described. The material is suitable for making outdoor apparel for wear in rugged environments, for example, where brambles, briers or dense underbrush are likely to be encountered.
Abstract: A composite material comprising a porous polymeric material bonded to a silicone resin substrate with a silicone-based adhesive agent, wherein only part of the pores of said porous material in the thickness direction thereof contain said silicone-based adhesive agent.
Abstract: This invention provides for a continuous PTFE fiber having on its surface a substantially round profile and a single spiralling seam formed from a continuous sheet of polytetrafluoroethylene which is helically rolled and self-adhered. The PTFE sheet may include microporous PTFE as well as expanded microporous PTFE. The PTFE sheet may be filled with particulate fillers or coated with polymeric coatings prior to the formation of the inventive fiber. The PTFE sheet may be used to contain various filamentary or sheet-like elements with the inventive fiber.The method for producing the inventive fiber is also disclosed.
Type:
Grant
Filed:
January 8, 1993
Date of Patent:
February 22, 1994
Assignee:
W. L. Gore & Associates, Inc.
Inventors:
Donald L. Hollenbaugh, Jr., Gordon L. McGregor, Raymond B. Minor
Abstract: A storage vessel for storing grain or other natural products comprises a gas-impermeable enclosure having a water-vapour-permeable membrane to allow the grain to breath and dry, and to prevent condensation and mould growth. The membrane is impermeable to oxygen gas to allow a reduced oxygen atmosphere (e.g. 3 to 7%) to be established as oxygen is used up by insect pests within the grain. The insects are unable to survive at such low levels of oxygen. Thus the grain is protected against pests without the use of chemical pesticides.
Abstract: A gas permeable material having continuous pores through it, in which the pore interiors are coated with a coating composition of the formula: ##STR1## wherein B is selected from the class consisting of ##STR2## R is (--CH.sub.2 --).sub.x wherein x is a cardinal number of 1-4; Y is C.sub.n F.sub.2n+1 or ##STR3## where n is a cardinal number of 3-20 and R.sup.1 is H or alkyl of 1-4 carbon.
Abstract: A twisted pair data bus cable is provided which is small, lightweight and flexible.The cable consists of a pair of insulated conductors twisted about one another, which has sections of the cable surrounded by metallic shielding, in which the sections surrounded by metallic shielding having a thicker insulation cross section than the sections not surrounded by metallic shielding.
Abstract: A resin-sealed semiconductor device, including a chip mounting die pad, porous fluorocarbon material located just beneath the die pad, beneath a die-pad supporting layer, gold lead wires, or in a sealing resin surrounding the other components, wherein any water vapor generated by the heat of soldering will be held within the porous fluorocarbon rather than crack the sealant under internal pressure.
Abstract: This invention provides for a continuous PTFE fiber having on its surface a substantially round profile and a single spiralling seam formed from a continuous sheet of polytetrafluoroethylene which is helically rolled and self-adhered. The PTFE sheet may include microporous PTFE as well as expanded microporous PTFE. The PTFE sheet may be filled with particulate fillers or coated with polymeric coatings prior to the formation of the inventive fiber. The PTFE sheet may be used to contain various filamentary or sheet-like elements with the inventive fiber.The method for producing the inventive fiber is also disclosed.
Type:
Grant
Filed:
October 17, 1991
Date of Patent:
January 25, 1994
Assignee:
W. L. Gore & Associates, Inc.
Inventors:
Donald L. Hollenbaugh, Jr., Gordon L. McGregor, Raymond B. Minor
Abstract: The present invention provides a water evaporation conduit for use in humidifying equipment that is not adversely affected by contact with oils, detergents, and other liquids used in the manufacture and maintenance of the equipment.
Abstract: A low profile cable housing a multiplicity of electrical, mechanical, or optical fiber components or a mixture thereof which has component breakouts within the length of the cable at any point or points between the ends of the cable which do not add to the profile or mass of the cable and processes for its manufacture and for sizing a cable to constant cross-section.
Abstract: An electrical ribbon cable of parallel, coplanar conductive wires having an insulating layer of sintered porous PTFE tape around each of the wires, and a second insulating layer of porous sintered PTFE film around the wires. A conductive layer is then applied and then an outer insulating layer. The cable may be simply and quickly mass-terminated by means of standard tools and connectors. It is constructed such that the velocity of propagation of a signal along any wire is greater than 85% of the velocity of propagation of signals along similar wires suspended in air, and such that the time delay of signal propagation from one end of any wire to the other end is less than 1.17 nanoseconds per foot of length of the cable.
Abstract: The present invention provides porous fluoropolymer articles for diffusion of gases into aqueous liquids whose surface is coated with a hydrophilic fluorine-containing copolymer.
Abstract: When an antioxidant, such as a selected secondary aromatic amine additive, is employed with a blend of thermoplastic polyester elastomers, the extrusion range window of at least one of the elastomers is altered to the extent that the blend can be uniformly melted and extruded.
Abstract: A coaxial cable side tap assembly of a coaxial cable with pins separately attached to the cable center conductor and braided sheath for connecting to a branch cable or an integrated circuit or transducer microchip and processes for manufacture thereof.
Abstract: Expanded polytetrafluoroethylene-buffered, polyester insulated, braided aramid sheath or aramid cloth strengthened, fire retardant jacketed optical fiber ribbon cables having precisely spaced optical fibers and processes for their manufacture.
Abstract: A carrier sheet for printed circuits and semiconductor chips having enhanced adhesion of conductive metal layers to a fluororesin surface resulting from rendering the fluororesin surface hydrophilic by a hydrophilic macromolecule before plating the metal onto the surface.