Abstract: An EFL D-type latch employing an EFL storage cell (17) controlled by a two-level tree of differential transistor pairs (12, 14 and 32, 34). Also described are counter cells, up counters, down counters and up/down counters, including binary, hexadecimal and BCD types, which can be formed from master/slave combinations of D-type and D-type latches. Examples of specific three-level and four-level EFL realizations of the counter cells are also described.

Abstract: A circuit pattern printing system includes alignment apparatus (71) which is located remote from a printer (35). The alignment apparatus includes a means for displaying a cursor (69) on a video screen (101). The cursor identifies a desired position of a fiducial mark (61) printed on a substrate (106) when the substrate is positioned against a reference guide (86) on an alignment table (76). The cursor (69) and the reference guide (86) are aligned to each other by first aligning the reference guide (86) to an alignment marker on a standards substrate (41), and then aligning the cursor to a fiducial mark located on the same standards substrate.

Abstract: A crystal network device (10 or 200) includes a plurality of separable interconnected crystal resonator devices (12, 14, 16 and 18 or 202, 204 and 206) having different resonant frequencies. Each of the crystal resonator devices comprises a molded plastic support member (22, 68, 90, 142 or 208, 264, 283) having a plurality of unitary terminals (32, 120 or 222, 264, 292), which may be of J-shaped construction, mounted thereon.

Abstract: A support shelf (12) having high strength and of unitary sheet metal construction, for supporting a plurality of closely-spaced printed circuit boards (28 and 29) and aligning the boards with respect to closely-spaced upper and lower connector plugs (24 and 26) of a backplane assembly (22) includes spaced front and rear support sections (40 and 42) and spaced front and rear guide sections (60 and 66).

Abstract: A removable mask (22) protects at least one portion of a substrate (10) during treatment such as irradiation thereof. To obtain mask (22), there is applied over said portion of substrate (10) a parting layer (44) of a metal selected from the group consisting of nickel, aluminum, indium and tin. Over the parting layer (44), there is applied the removable mask (22) of a material which is adherent and harmless to the parting layer (44) and is substantially impenetrable by the treatment. After irradiation, the parting layer (44) is treated with at least a detaching agent sufficiently to detach said parting layer (44) and the mask (22) from substrate (10). For proton bombardment of a substrate (10) which includes gallium arsenide, the parting layer (44) is preferably nickel, the mask is preferably gold and the detaching agent includes hydrochloric acid.

Abstract: A diffusion furnace (11) includes a typical process tube (12) and an outer envelope (26) which forms an annular chamber (37) with the process tube. A heating element (29) of high purity graphite substantially surrounds the process tube within the chamber (37). Inner surfaces of the chamber (37) are made of materials such as, for example, silicon, pyrolytic graphite or quartz. Such materials are essentially free of harmful impurity elements such as iron, nickel, copper calcium or gold, which have an energy level about halfway between the valence and the conduction band of a semiconductor material to be processed within the process tube. A nonoxidizing gas within the heater chamber protects the graphite elements therein from oxidation. A small gas flow within the chamber (37) is preferred to purge such harmful impurity elements as may penetrate into the chamber during the operation of the furnace.

Abstract: An electronic device assembly (11) includes a heat dissipating substrate (18) having a seat (16). A device (14) is uniformly spaced from a base surface of the seat (16), and a layer of solder of uniform thickness occupies a gap between the surface of the seat and the device. Leads (31) and (33) extend at a shallow, acute angle from the device. A lead (32) is mounted to a support (28) extending from the substrate (18). Inner portions of the leads (31, 32, 33), the device (14) and portions of the substrate (18), are encased by an envelope (22), while outer portions (67) of the leads and a mounting tab (19) of the substrate extend from the envelope.

Abstract: A cable which is capable of being made in a large pair size and yet which has excellent mechanical properties that maintain its integrity notwithstanding extremes in temperature during installation and shipping as well as during the rigors of installation includes a sheath system having a corrugated steel outer shield that is adhesively bonded to a plastic jacket. The corrugated steel shield which is formed to have a longitudinal overlapped seam that is preferably unsealed encloses an aluminum inner shield that in turn encloses a multiconductor core. Advantageously, the sheath system includes a plastic jacketing material which is capable of resisting biaxial stresses which are aggravated in a bonded sheath system. This results in jacket integrity about the longitudinal seam of the outer shield notwithstanding a notched cross-section and an unsupported bridged portion of the plastic jacket adjacent to the seam.

Abstract: A range extender with gain unit for coin telephone loops is disclosed. When coin control signals to be applied from a central office to the coin loop are detected, an amplifier circuit and a line feed circuit connected to the loop are disconnected thereby directly connecting the central office with the coin telephone. After coin control is completed, the amplifier and line feed circuit are reinserted into the coin loop. Coin tests and off-hook detection are aided by the use of circuits which draw current from the central office.

Abstract: A line circuit is disclosed for controlling communications over a communication pair between a switching machine and a key telephone station. The line circuit includes a dual sensitivity shunt detector arrangement (103, 104, 105) for improved detection of dc transients and ac ringing voltage signals appearing across the pair. A current diverter circuit (104) switches the sensitivity of the shunt detector arrangement depending on the operating state of the key telephone station.

Abstract: A connecting device for providing electrical continuity of a metallic shield of a jacketed distribution cable across a splice location and for electrically and mechanically connecting at least one service wire that is electrically connected to the cable at the splice location and to a customer's premise includes a first clamp which comprises an inner plate that is inserted under the shield until a stud upstanding therefrom abuts the cable jacket and shield. An outer plate of the first clamp and an arcuately formed bonding plate of a second clamp, said bonding plate having a relatively short length in a direction along the length of the cable, are positioned over the cable jacket until the stud extends through an opening in each after which a nut is turned onto the stud to secure the first clamp to the cable and the bonding plate to the first clamp.

Abstract: A phase compatibile polymer blend serves as a radiation sensitive lithographic resist in the fabrication of circuits and circuit elements. Radiation sensitivity is due to inclusion of a "modifier". Resist properties, notably stability to agents and ambients to be masked are attributed largely to a second component, the "matrix polymer".In an exemplary embodiment in which the blend is positive acting, fabrication including dry processing is dependent upon use of a resist blend of a vapor developing polysulfone and a novolac. The novolac, inherently soluble in alkaline media is rendered insoluble in the blend. Radiation initiated depolymerization results in volatilization of the modifier to render the irradiated portions of the resist soluble in alkaline developers.Modifier may function in other manner; for example, it may undergo radiation initiated polymerization so as to insolubilize the blend in irradiated regions, so resulting in a negative acting resist.

Abstract: A cable (20) specially suited for use in building plenums because of its low flame spread and smoke evolution includes a multiconductor core (22) which is enclosed in a sheath comprising an inorganic, cellular core wrap (31), a corrugated metallic barrier (40) and dual layers (51) and (52) of a polyimide tape which are wrapped helically about the barrier in a manner that avoids a compression of the core wrap. The sheath is effective to resist heat transfer inwardly toward the core by conduction while the metallic barrier reflects radiant heat. Advantageously, the sheath containerizes the core without unduly compressing it and thereby allows the intumescence of conductor insulation during a fire to form char which is effective to suppress the evolution of smoke and the propagation of flame.

Abstract: A polyvinyl chloride surface, such as plasticized polyvinyl chloride telephone cord jacket, is coated with a coating formulation comprising a medium molecular weight methyl methacrylate copolymer, cellulose acetate butyrate and a carbalkoxy benzyl phthalate plasticizer. The coating affords good adhesion, fast drying and stain resistance.

Abstract: A telephone service cable which runs from a distribution cable to a subscriber's premises or to a pay station is another link in a buried communications system having a water-resisting capability. A spirally quaded core comprised of individually insulated conductors is advanced through a bath of a flame-retardant, water-resistant composition prior to enclosing the core with a jacket. The interstices in the core and between the core and an inner jacket are caused to be filled with the composition which comprises a liquid system and a solid system. The liquid system includes a chlorinated paraffin while the solid system includes a polyvinyl chloride resin and a chlorinated polyethylene. An epoxy stabilizer and a phosphite stabilizer may be added to prevent thermal degradation of the filling composition.