Abstract: A high-efficiency, low-cost D.C. to A.C. electronic inverter generates sinusoidal ouptut voltage(s) by utilization of an oscillator and divider circuitry that generates extremely precise symmetrical control signals. These control signals cause a push-pull amplifier comprising power switch drive transistors to periodically alternately energize power switches comprising two banks of matched output transistors, that in turn generate high current inputs to a ferro-resonant transformer. The transformer is tuned to provide the desired output sinusoidal voltage.The inverter incorporates unique overload and short-circuit protection electronics that prevent catastrophic destruction of the power switch drive transistors as well as the power switch transistors. Furthermore, to maximize the inverter's efficiency, the power switch driving circuit receives electrical energy from the ferro-resonant transformer in order to insure deep saturation of the power switch transistors.

Abstract: A miniaturized computer controller system utilizes reprogrammable "read only" ultraviolet memory chips instead of conventional core memories to store a control program comprising variable information regarding all electrical elements in all electrical circuit lines of the controller. The memory chips are reprogrammable within the controller and thus delicate removal of the chips for reprogramming is eliminated. The controller utilizes a central processor removably interfitting with a reprogramming module that also communicates with a programming panel.When in a "monitor" mode, the programming panel, in conjunction with the reprogramming module, allows the operator to view any particular electrical circuit line while the controller is operating. A scroll switch on the programming panel further allows the operator to view sequentially higher or lower numbered electrical circuit lines while a trace switch provides for examining any electrical circuit line to which a currently viewed element is referenced.

Abstract: By providing an input/output panel housing which is readily connectible to adjacent housings and which cooperates with up to four removable input/output modules, a completely expandable, modularized input/output panel construction is achieved. Each housing accommodates up to four "plug-in" input/output modules, and is constructed so that the wiring from the equipment being controlled is connected directly to fixed terminals and need not be removed when the input/output modules are removed or replaced. Since each housing is readily connectible to adjacent housings, the input/output panel board construction of this invention is completely flexible and readily expandable to meet any desired operational needs.

Abstract: A unitary beverage container lid allows easy opening and drinking therefrom without the generation of removable parts. The lid, which may be integrally formed with the cylindrical sidewall of the container, incorporates a generally dome-shaped central portion incorporating a pair of radially projecting abutting ribs. The line defining the adjoining edges of these ribs is scored for easy tearing. The dome-shaped central portion terminates with a downwardly, inwardly projecting peripheral sidewall that is sealed to or integrally formed with the cylindrical sidewall of the container. An upstanding arcuate rib with tapered ends forms a portion of the terminating region between the central portion and the peripheral sidewall and is scored by an arcuate score line.Initial depression of a centrally located button on the dome-shaped portion of the lid causes the tapered rib to tear from the sidewall of the lid, thereby initiating the separation of the two abutting ribs.

Abstract: A beverage dispenser-mixer capable of storing, cooling, mixing and serving beverages incorporates a thermally insulated, open-ended refrigerating enclosure with inside walls composed of a thermally conductive material communicating with a refrigerating means. A beverage container with an open top incorporates a thermally insulated front plate that removably interfits with the inside walls of the refrigerating enclosure to form a mechanically and thermally sealed beverage storage compartment. The beverage container includes a fluid agitator that removably engages with an agitator motor within the enclosure for mixing or stirring beverages within the beverage container. The beverage container further incorporates a handle and a spigot with a pinch-type valve for dispensing beverages within it.

Abstract: By providing a frame structure and two panels adapted for removable, interlocking mounting on the frame structure, a sign housing is obtained which is rapidly assemblable without the use of screws, clips, or other such fastening means. In the preferred embodiment, the sign housing is employed as an illuminated emergency exit sign, and can be flush-mounted with only one side viewable or mounted to ceilings or walls with both sides viewable. Also, an emergency power supply can be secured directly to the sign housing to provide a complete independent package.