Abstract: Auto loading gas operated firearm capable of handling a variety of ammunition loads having one or more gas relief valves for the initial volume of the gas cylinder of the firearm, the valves having a leaf spring covering the gas apertures to control the flow of gas from the initial volume of the gas cylinder, and a shaped geometric body interposed between the spring and each aperture that interacts with the spring and aperture to form a seal footprint which is a circular line or ring, the spring preferably operating in a plane substantially perpendicular to the recoil axis of the firearm.

Abstract: An orthodontic device comprising filament and one or more retaining sheaths through which the filament is looped, useful for retaining wires on orthodontic brackets.

Abstract: A knife blade suitable for use as a spanner wrench in the installation and removal of choke tubes in shotguns, characterized by recesses on one edge, preferably matching the diameters of 12 and 20 gauge shotguns.

Abstract: Apparatus and method for producing heat weldable, thermoplastic, tubular pipe fittings for use with heat weldable piping or tubing using a core in a molding machine having at least one pivoted segment collapsible inwardly of the core, each segment bearing radial projections to facilitate winding a heater wire and/or to receive a terminal post during the molding operation.

Abstract: A roll assembly (50) for a fiber drafting machine is positioned on a spindle (51). First and second locking collars (52), (53) on spindle (51) define a space within which is positioned a pair of bearings (40). An annular bearing sleeve (55) is positioned in bearing contact with bearings (40). Bearing sleeve (55) includes a bore (56) from one end to the other which includes a stepped portion (57) defining two spaced-apart shoulders (58), (59). Flange (42) of the two bearings (40) seat flush against the innermost surface of locking collars (52), (53). A flange edge (45) of each of the bearings (40) is positioned in bearing contact with the inner walls of bearing sleeve (55) defining bore (56) to provide a radial bearing surface. Shoulders (58) and (59) abut and bear against shoulder (44) of flange (42) of bearings (40) and provide a thrust bearing surface along the axial length of spindle (51).

Abstract: Polyhedral structures that approximate an ellipsoid made up of generally irregular polygons.

Abstract: An amine-substituted acrylic polymer prepared by reacting an acrylic polymer having glycidyl functionality with amine, under process conditions which result in high amine functionality, and a coating composition incorporating the acrylic polymer as a binder component.

Abstract: Process for lining a pipe with thermoplastic polymer using non-crosslinked, expandable thermoplastic liner which is uniformly heated after insertion into the pipe.

Abstract: Heating apparatus particularly useful for installing heat expandable plastic pipe liner comprising a radiant heater and air circulation means for the uniform distribution of heat about the circumference of the plastic pipe.

Abstract: A process for the ammoniation of acrylic resins containing glycidyl methacrylate units that results in high amine functionality.

Abstract: Block copolymers composed of similar monomers, but which exhibit subtantially different polarity, one of the blocks having cationic ammonium, phosphonium, or sulfonium moieties. The block copolymers, which are preferably prepared by group transfer polymerization techniques provide excellent performance as pigment dispersants, without the need for special salt-forming components.

Abstract: Particulate polyimide molding resin characterized by high surface area and low crystallinity and molded articles prepared therefrom having unusually high toughness.

Abstract: Stabilized acrylic resin having a core of acrylic polymer and a substantially linear stabilizer having one polymerizable functional group at one end of the stabilizer molecule, the resins being useful as rheology control agents for coating compositions.

Abstract: A polyhedron that approximates a sphere made up of generally irregular polygons.

Abstract: A hood for providing breathable air having CO.sub.2 absorption means within the hood.

Abstract: Particulate polyimide molding resin characterized by high surface area and low crystallinity and molded articles prepared therefrom having unusually high toughness.

Abstract: A high strength powder metal part formed from an alloy of iron, nickel, molybdenum and carbon and having an ultimate tensile strength of at least 175,000 pounds per square inch. The powder metal part is made by mixing the alloy with a lubricant, forming the mixture into the desired part shape, sintering in a dissociated ammonia atmosphere, and cryogenically cooling the sintered part.

Abstract: A method for the recovery of silver from photographic film having a polyester base and a macromolecular organic polymer coating to which is adhered a light sensitive silver emulsion layer. The process includes mixing small film pieces in a hot aqueous liquid having a solids concentration level of at least 25 percent by volume. The mixture is subjected to conditions of high shear to remove the silver emulsion. The liquid containing the silver emulsion is then separated from the film pieces and the silver is recovered from the liquid.

Abstract: Antistatic hairbrush bristle having a nylon or polyester core and a compatible polymeric sheath containing carbon.

Abstract: A process for producing acrylic polymers at a high rate which have high thermal stability, are free of defects and have a low level of unreacted monomer by polymerization of a methyl methacrylate syrup in the presence of a mixture of three peroxide initiators.