Abstract: An O-ring is made of elastomeric material. It lies in a plane. The O-ring has a circular radial axial section. The O-ring is provided with a concentric slot that extends perpendicular to the plane from a surface of the ring to a point past the center of the circular axial section. The O-ring conforms to confined spaces by bending and closing the slot.

Abstract: An enclosure is shielded from electromagnetic radiation, especially for testing electronic equipment such as cellular telephones. An electrically conductive housing with a rectangular chamber has open top with a flange extending upward from its perimeter. An electrically conductive closure hinged to the housing has a peripheral groove holding a conductive spring finger assembly. When closed, the flange fits into the spring finger assembly, forcing the fingers apart and against the walls of the groove. This provides excellent conductive connection between the housing and the closure through the flange, the fingers, and the groove. The conductive spring finger assembly is machined from thin beryllium copper strip, formed to final shape into straight portions and corner portions with small radii and then heat treated to retain its final spring form.

Abstract: A method of joining metal parts together and the joints thereby produced having great strength and thermal conductivity by means of an adhesive filled with small, hard, thermally conductive particles. The filled adhesive is applied to the surfaces to be joined and the surfaces are pressed together with a force in the range of 35 to 105 Kg/sq cm while the adhesive is curing. A fixture is disclosed made of a metal with a coefficient of thermal expansion less than the parts being joined. When the parts are held in the fixture and heated, differential thermal expansion causes the fixture to apply the necessary pressure during curing while also providing a measure of the applied pressure. For joining a cooling fin normal to the surface of a part, a tapered plug is formed in the fin edge and it is forced into a tapered slot in the part after adhesive application. A low external perpendicular force applied to the fin yields a high pressure to the mating surfaces through the inclined plane.

Abstract: A metallic assembly transfers heat from a hot surface in contact with a heat source to specially shaped air passageways where cooling air is blown through. The air passageways in the metal assembly are arranged with a large metal surface area in contact with the cooling air for efficient heat transfer with low resistance to air flow. The passageways are formed by stacks of streamlined posts alternating with fins. The alternating layers are formed separately, stacked together, compressed, and subjected to hot dip brazing. This melts a low melting layer of cladding metal between metal layers to form the assembly into an integral assembly with efficient heat transfer between layers with reduced manufacturing costs.

Abstract: A carrier recovery circuit is disclosed for use in the receiver of a digital transmission wherein channels of data are formed by demodulating incoming quadrature-related carriers using receiver-generated, quadrature-related carriers. Phase alignment of the receiver-generated carriers to the incoming carriers is provided by integrated data from a preselected channel when the channels of data correspond to preselected regions in the signal space diagram.