Abstract: An industrial process oven is provided with a false outer skin spaced from the oven wall. A plurality of air currents are induced and estalished in a like plurality of air passages provided between the oven wall and the outer skin. As ambient air passes over the oven wall it is preheated. The preheated air from the plurality of air passages is collected in a transfer duct and conveyed to an oven heater where its temperature is further raised to a desired operating temperature.

Abstract: An anti-theft clip for securing a conventional lock cylinder to a car door and for preventing unwanted tampering with a lever operatively connected to the lock cylinder. The clip includes resilient legs which straddle and hold the lock cylinder. Panels attached to the resilient legs shield the lock cylinder from unwanted tampering.

Abstract: A key cutting apparatus for cutting a series of longitudinally spaced notches in the blade of a key blank according to specifications set forth in key manufacturer's code books. The apparatus includes a cutter mounted on a base, a carriage assembly movably mounted on the base for controllable movement toward and away from the cutter; the carriage assembly includes a sub-carriage adapted for controllable independent movement in a direction perpendicular to the carriage assembly movement. A key blank clamping assembly secured to the sub-carriage holds the key blank for the cutting operation and cooperates with positioning means which effects proper positioning of the key blank to permit cutting of the first notch at a code book specified distance from a reference point which is generally the key blank shoulder. The remaining notches are equidistantly spaced from each other along the remaining portion of the key blank blade. A variable spacing control assembly allows selection of this spacing.

Abstract: A high strength positive locking fastener for securing structural panels together is disclosed. The fastener includes a stud receptacle and a stud assembly. The stud receptacle is mounted on an inner panel spatially fixed with respect to an outer panel and includes an interiorly threaded basket nut with assembled washer fixedly mounted thereon and a cage which is fastened to the inner panel and which movably receives the basket nut and washer assembly. The stud assembly passes through substantially coaxial openings in the panels and then into the basket nut assembly. The stud assembly includes a threaded stud having a bore therethrough containing a spring loaded plunger with a pair of locking balls resting thereon. To engage the fastener and secure the panels together a tool is used to depress the plunger forcing the balls against a reduced plunger diameter and allowing the stud to pass through the panel openings and into the basket nut.

Abstract: A solenoid operated arming unit under the control of an aircraft pilot wh allows the pilot to selectively eject an armed or unarmed weapon at his discretion. To release an armed weapon, the solenoid is energized to thereby lock opposed jaws about a ball and arming wire assembly; as the weapon falls away from the aircraft, the immobilized arming wire assembly pulls free of the weapon fuze to thereby arm the weapon. To release an unarmed weapon, the solenoid is not energized; as the weapon falls away from the aircraft, the ball and arming wire assembly is pulled free from the arming unit retaining jaws and remains attached to the weapon fuze.The arming unit is configured to eliminate deleterious arming unit preloading and is so constructed that the arming wire assembly may be jettisoned after an armed weapon is dropped to thereby prevent damage to the aircraft from arming wire assemblies which flail in the aircraft's windstream.

Abstract: A porous aluminum body comprised of aluminum pellets bonded together with a substantial portion of said space therebetween remaining open and a method for making such body wherein said aluminum pellets are (1) coated with a powdered solder mixed with a paste-like flux, (2) placed in a mold, and (3) heated in a substantially inert environment to a temperature sufficient to bond adjacent aluminum pellets together.

Abstract: Disclosed is an improved metal oxide varistor particularly suitable for varistor operation at low voltages such as 80 volts and less, and a method for the manufacture thereof. The varistor comprises a body portion compounded of a primary component and a plurality of additives. The additives are, before combination with the primary component, mixed thoroughly and reacted to form a crystalline reaction product. After grinding, the reaction product is mixed with the primary component and the body is further processed in the conventional manner.

Abstract: A semiconductor device and method of manufacture therefor includes the establishment of at least one PN junction in a semiconductor chip through conventional techniques. Electrical contacts are formed. The entire semiconductor device is coated with a passivant coating having a first layer of low temperature silicon dioxide and a second layer of glass, the second layer of glass being applied in two steps.

Abstract: In a video communications system for remotely located conference rooms, a voice-operated switching (VOX) circuit comprising:1. an audio level discriminator (ALD) circuit for eliminating input audio signals below a predetermined magnitude and for locking out access to the VOX circuit when another VOX circuit is activated;2. an audio duration control (ADC) circuit for controlling the activation of the VOX circuit and the possible loss of access to and preemption by another conferee during pauses between audio signals from any conferee presently having activated the VOX circuit and associated video system;3. an attack time control (ATC) circuit for preventing short duration audio signals above the threshold level of the ALD circuit from activating the VOX circuit; and4. an activation circuit for coordinating the output signals of the ALD, ADC, and ATC circuits and operating a video switcher in response to the aforesaid output signals.

Abstract: Disclosed is an SCR pellet and a method for the fabrication thereof. A layer of oxide is grown on a semiconductor wafer that has been diffused to form a plurality of SCR pellets and openings are etched in the oxide at locations corresponding to each pellet. Gold is diffused through the openings into a preselected distribution in the base region to reduce turnoff time. Grooves are etched to facilitate glass passivation and division of the wafer into pellets.