Abstract: A thin, low density porous polytetrafluoroethylene membrane having very large pores and heretofore unknown high air permeabilities is described. The membrane is produced by a particular series of longitudinal and transverse stretching steps carried out under particular conditions.

Abstract: A method for fastening soft porous polymer tubes into a fastening seat by remolding the tube ends by compression to remove porosity before insertion into the seat or pressure insertion of a hard, strong tube into each porous tube after insertion into the fastening seat to compress it. An adhesive is used to fill the seat to hold the tubes in place.

Abstract: A snorkel device for breathing under the surface of water which will allow both inhaling and exhaling of air underwater. A multiplicity of water impermeable tubes, permeable to dissolved or gaseous oxygen, allow underwater passage of oxygen into the snorkel. Preferred tube material is porous expanded polytetrafluoroethylene.

Abstract: A filter cartridge for removing particles or dust from a stream of moving gas or air, including a filter medium disposed between a pleated inner wire support frame, outer longitudinal wire support stays disposed along each inner apex of the pleats of the filter medium, and end caps. The outer wire stays are formed from inwardly bent wires which attach at each end to the inner frame and exert pressure on the filter medium to support it against inner pressure of a pulse jet cleaning device. Preferred filter media are felt or fabric composites containing a layer of porous expanded polytetrafluoroethylene membrane. A preferred form of lower end cap has the periphery contoured to conform to the configuration of the filter medium and inner support frame. The cartridge structure is advantageous in preventing build-up of ledges of dust on protuberances, with consequent reduction of filter efficiency.

Abstract: A sensor cable for detecting and locating liquid chemicals, especially hydrocarbons, and/or water leaks without interruption of the system, wherein two or three conductors and appropriate insulation are arranged in a configuration that provides circuits for detecting and locating liquid chemicals and for detecting and locating liquid water.

Abstract: A weather-resistant windproof lined garment having a stretchable liquid waterproof, water-vapor-transmitting liner. The garment provides protection for active outdoor wear for golf, walking, tennis, hiking, soccer, and the like.

Abstract: For use on individual coaxial and twin axial cables, a shield integrated contact connector with housing and retention means is provided for pluggability onto an array of closely spaced standard male pins in rows on printed circuit boards and other high density grouped signal transmittal configurations. It features signal fidelity through the connector while maintaining compatability with high density mass pluggable signal requirements.

Abstract: An anti-fouling marine coating comprising a hydrophobic porous polymeric membrane adhered to a surface by a marine paint containing a biological toxicant. An organism attaches, penetrates pores, releases the toxicant, weakens or dies, is swept away by water action. Biologically triggered toxicant release, no leaching into the sea, porous expanded polytetrafluoroethylene membrane preferred.

Abstract: The present invention provides for a bone growth material for filling in defects or hollow portions of bones to be ingrown by and coalesce with bone tissues wherein the bone growth material is comprised of expanded PTFE and calcium phosphate.

Abstract: A method for terminating a coaxial electrical cable by dip-soldering a metal ferrule to the outer braided shield surrounding an end.

Abstract: A liquid leakage sensor having spaced apart pairs of insulated conductors on oppositge sides of a strip of insulation and aperture access from one side of the strip to conductors on the other side. Can be wrapped about small pipes or objects without conductor breakthrough of insulation and electrical contact with pipe.

Abstract: A container for adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene sealed at both ends, so as to encapsulate an adsorbent present with the tubular structure.