Abstract: The present invention relates to a hermetically sealed Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 glass ceramic-aluminum containing stainless steel composite body and a method of producing the body. The composite body includes an oxide interfacial region between the glass ceramic and metal, wherein the interfacial region consists essentially of an Al.sub.2 O.sub.3 layer. The interfacial Al.sub.2 O.sub.3 region includes constituents of both the metal and glass ceramic.

Abstract: An electrically conductive circuit member for use within a multilayered circuit board assembly wherein the member comprises a sheet of electrically conductive material (e.g., copper) and first and second layers of electrically insulative material (e.g., prepreg) bonded thereto to substantially encapsulate the conductive material therein. The conductive material includes a plurality of apertures and a plurality of elongated openings, which openings are mechanically provided in a predefined pattern to assure at least two electrically isolated regions within the singular, planar conductive material. A method of making this circuit member is also defined, said method not requiring the need for wet/chemical processing and the disadvantages associated therewith.

Abstract: A flat, flexible cable construction comprises two flat, flexible insulating strips each including a plurality of electrical conductors extending along one side of one strip and the opposite side of the other strip, which electrical conductors are exposed at their ends on the inner contacting faces of the two insulating strips. Each of the insulating strips is formed with a transversely-extending slit starting from the edge of the side not including its respective electrical conductors and terminating short of the side including its respective electrical conductors, whereby the two ends of the insulating strips may be transposed by inserting the non-slitted side of one into the slitted side of the other to thereby transpose the outer exposed ends of the electrical conductors from the inner contacting faces of the insulating strips to the outer non-contacting faces of the insulating strips for connection to an electrical connector.

Abstract: A differential-mode signal transmission system includes a circuitboard composed of at least one dielectric board substrate and a pair of spaced apart conductive parallel planar signal transmission lines disposed on one surface of the substrate and extending between a pair of edges thereof for providing pass-through transmission of differential-mode signals from one to the opposite edge of the substrate. Preferably, the circuitboard is composed of at least a pair of dielectric board substrates being disposed in face-to-face layered contact with one another and having at least one pair of the spaced apart conductive parallel planar signal transmission lines disposed between the layered substrates along the inner surfaces thereof. Ground planes are provided on the outer surfaces of the layered substrates for electrically shielding the parallel planar transmission line pair.

Abstract: Conductors of a flexible printed circuit routed through a hollow two axis articulated hinge allow a calculator with rotating case halves to possess a keyboard portion in each half of the case. The conductors routed through the hollow articulated hinge are generally centered about one axis of hinge rotation for approximately half the length of the axis, whereupon they transition by either a U-turn or a jog to continue as centered about the other axis of hinge rotation. The conductors may be an integral part of a flexible membrane keyboard assembly having portions located in both halves of the calculator's case. Strain reliefs at the locations where the conductors traverse the case halves, and two in the hinge, at about the center thereof, limit and apportion the torsional flexing experienced by the conductors. The torsional flexing experienced by the flexible conductors increases the number of cycles of rotation they can undergo without breaking, as compared to conventional bending.

Abstract: A flat cable bus with fan-out patterns which provide equal length wires to eliminate clock skew is disclosed.