Abstract: A fiber optic illumination cable comprises two fiber optic illumination bundles and a resilient, flexible, light-absorbent material which separates the two bundles. The first bundle has a generally round cross-section, and is covered with a resilient, flexible light-absorbent material. The second illumination bundle is disposed about and contiguous with the resilient, flexible, light-absorbent material layer which surrounds the first bundle. The second illumination bundle is cabled to form an annular ring, with a generally circular cross-section, which gives the final cable an even, full, round cross-section, with a low cross-sectional area. The two cabled illumination bundles are covered with a layer of a resilient, flexible material, which does not need to be light-absorbent, and a protective polymer jacket.

Abstract: A polymer-insulated crush-resistant high-strength optical waveguide fiber cable buffered by a braided layer of porous polytetrafluoroethylene fibers to provide strength, a low thermal expansion coefficient buffer, and strong environmental protection.

Abstract: A chemically protective laminate comprising a thin thermoplastic barrier layer, having a consistent thickness, laminated between two porous polymeric membrane layers. The porous polymeric membrane may be of porous polytetrafluoroethylene, preferably expanded porous polytetrafluoroethylene. The chemically protective laminate may be subsequently adhered to a backing to form a fabric laminate capable of being assembled into a chemically protective article.

Abstract: A fiber of expanded porous polytetrafluoroethylene in which an amount of a conductive particulate filler is incorporated imparting a measure of conductivity to the fiber is disclosed. The fiber may be twisted along its length. The fiber may be a continuous monofilament fiber, a tow, a staple, or a flock.

Abstract: A sealing material of polytetrafluoroethylene felt is encapsulated by a polytetrafluoroethylene sheet coated with a thermoplastic fluoropolymer.

Abstract: A leak detection system and method are disclosed in which an electrical circuit uses time domain reflectometry techniques to monitor one or more leak detection cables for impedance changes which are caused when a cable is contacted by a leaking liquid. The circuit of the system includes an electrical pulse generator means for generating a single electrical launch pulse, and for selectively transmitting the launch pulse down one of the cables. A delay means responsive to the launch pulse produces a reset signal upon the transmission of the launch pulse. A sensing means connected to a selected cable produces a trip signal upon receiving a reflected launch pulse which exceeds one or more predetermined thresholds. A latch means connected to the sensing means latches (sets) upon receiving the trip signal and unlatches upon receiving the reset signal. A counter means which is responsive to the reset signal and the trip signal measures a time difference therebetween.