A digital controller for a converter comprises a memory for storing digital representations of the switching patterns for operating the converter to produce a predetermined segment of each one of a plurality of waveforms, respectively, the memory being operable for repetitively outputting at least a selected one, or concurrently one per phase, of the switching patterns, the waveforms being divided into equal angled zones, a respective predetermined segment when oriented in phase and made of appr...

A hierarchical organization of programmable logic arrays permits the control of microprocessor functions to be achieved in a way which allows otherwise wasted clock time to be used. The mostly independent operations of the several PLA's is organized by "handshake" signals from the latches of one PLA to those of another via AND circuits operative to selectively enable clock signals, in some instances, and data in other instances, to be applied to the latches. The use of the AND circuits enables r...

The method of, and apparatus for, producing an electrical video signal representing a charge pattern on an insulating dielectric sheet or film, without destroying the charge pattern, including the steps of: placing a transparent electrode on the free top surface of the dielectric film, placing the dielectric film having the charge pattern in close contact with the free top surface of an uncharged photoconductor having a back electrode connected to a load impedance, and scanning the photoconducto...

A stored heat cooking utensil is provided which consists of an outer container, a cooking vessel, a heat storage element, a lid for enclosing the outer container and cooking vessel, a handle for manipulating the cooking vessel and the heat storage element, and a container handle which serves as a carrying handle for the cooking utensil and a lid securing device. The outer container consists of an insulated container having a tapered interior metal lining with an upwardly directed projection in t...

A vacuum breaker operator in which a breaker closing drive spring is charged by a charging mechanism including a drive lever mounted on a drive shaft coupled to compress the spring as the lever is rotated. A drive gear is rotatively mounted on the drive shaft. Coupling means couple the drive gear to rotate the drive shaft to rotate the lever and charge the spring during a charging operation and decouple the driven gear during a spring discharging operation. A drive linkage is coupled to said spr...

An intelligence display apparatus comprising: (a) an envelope comprising a substantially transparent faceplate: (b) illumination means for directing light toward said faceplate: (c) an intelligence selection element disposed between said faceplate and said illumination means, said selection element comprising first regions substantially transparent to said light and second regions substantially opaque thereto, said first and second regions having respective widths in the ratio of about 6:7 to ab...

A battery is connectable through a mechanical switch to bias a solid state switch and to charge a capacitor. When the mechanical switch is open, the capacitor supplies current to bias the solid state switch. The battery is connected for supplying a trickle electrical current to the capacitor when the mechanical switch is open for maintaining a charge on the capacitor for a substantial period of time without materially discharging the battery.

A method and apparatus for use in electronic computer for altering a stored program. The deletion of an instruction from a main memory storing it results in a compression of the program that included the deleted instruction in order to conserve memory space. The insertion of an instruction in a program stored in a main memory results in the shifting of subsequent instructions stored therein. The memory may be divided into arbitrary sections in response to an instruction enabling the search of a ...

An improved stored energy impact fuze wherein a spring loaded firing pin is normally restrained in the spring loaded position by a holding mechanism which includes a ball detent positioned in a slot on the firing pin and held in place by a hinged plate. Upon impact, the hinged plate is driven forward allowing the ball detent to move away from the slot on the firing pin, thereby releasing the firing pin. The hinged plate is held in position by a holding pin which lies between the plate and a roto...

A three terminal electronic circuit having a negative resistance characteristic at its two input terminals that has application as an intermittently operated measuring circuit, an oscillator and other uses. A DC comparator circuit operates a power switch in series with a load in response to comparing the voltage at the input terminals with two distinct reference voltages, one reference voltage being utilized when the load power switch is off, and the other reference voltage being utilized when t...