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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 4233546 | Stroboscopic beacons fed from a capacitive source The present invention relates to a system for energizing flash-tubes of beacons by means of the capacitive energy extracted from an insulated section of the overhead wire of power transmission lines. The supply system comprises a circuit for transforming ... | 11/11/1980 |
| 4223232 | Battery charging circuit for an emergency system A single active element performs the multiple functions of regulating DC voltage level from an AC source supplied to charge a battery and of coupling the battery to power an emergency system such as an emergency lighting system upon loss of the AC source.... | 09/16/1980 |
| 4211956 | Light indicating system having light emitting diodes and power reduction circuit A light indicating monitoring system includes a plurality of light emitting diodes (LED's) having a common ground connected to a phase controlled silicon controlled rectifier (SCR) circuit. The SCR circuit limits conduction of rectified AC energy through ... | 07/08/1980 |
| 4199754 | Circuit for an emergency lighting and fire detector system A circuit for a home safety unit having an emergency light system for providing light in the event of a power failure or when a fire is detected, and a fire detection system for providing an audible alarm indicating the existence of a fire. The circuit in... | 04/22/1980 |
| 4167680 | Emergency standby system for automatic transfer from utility power to a battery powered system An emergency standby power system for automatic transfer from utility power to a battery powered inverter when a normal source of utility power is interrupted to a given load, and for automatic re-transfer to utility power when it is restored. The inverte... | 09/11/1979 |
| 4160934 | Current control circuit for light emitting diode The current in a semiconductive light emitting diode (LED), driven by an insulated gate field effect transistor (IGFET) switch, is stabilized by a current control circuit including a comparator type feedback network, which stabilizes the voltage at a node... | 07/10/1979 |
| 4155081 | Rechargeable battery backup power source for an ionization smoke detector device A circuit for a rechargeable battery backup power source used with an ionization smoke detector device whereby upon the failure of the main alternating current power source, a battery which is normally charged from the power source during standby operatio... | 05/15/1979 |
| 4138670 | A.C. powered detecting device with battery backup An improved a.c. voltage powered warning device for detecting the occurrence of predetermined phenomena, is characterized by battery backup for providing power to the device in the event of interruption of the a.c. voltage. In the disclosed embodiments th... | 02/06/1979 |
| 4103298 | Alarm device An indicator device for providing a high-intensity visual indication of an occurrence comprises a flash tube which is fed with a high voltage from a capacitor, the capacitor being charged by means energized from an intrinsically safe supply. Trigger pulse... | 07/25/1978 |
| 4099073 | Four-level voltage supply for liquid crystal display A power supply circuit supplies a liquid crystal energizing circuit with desired potentials for the purposes of energizing a liquid crystal display in accordance with combinations between first, second, third and reference potentials. The power supply cir... | 07/04/1978 |
| 4088986 | Smoke, fire and gas alarm with remote sensing, back-up emergency power, and system self monitoring A system for sensing smoke and fire, primarily through the sensing of associated carbon monoixide and optionally with supplementary heat sensing, and for sensing hazardous gases and vapors. The system senses the presence of carbon monoxide, even in the ab... | 05/09/1978 |
| 4037191 | Aircraft warning marker assembly for power lines Aircraft warning marker assemblies for marking power transmission lines are often suspended from the power line itself and are in a few cases equipped with a flashing light energized with power obtained from the power line. The assemblies have in the past... | 07/19/1977 |
| 4013993 | Elevator system An elevator system including an elevator car mounted for movement in a building to serve the floors therein. The elevator car includes a car call station with a continuously energized light source associated with certain display functions. An emergency so... | 03/22/1977 |
| 3970939 | Signal generating and transmitting apparatus A self-contained alarm signal apparatus is disclosed which comprises an electrical signal generator, and encoder connected to receive the output of the generator and to encode a message to be delivered to a transmitter, a source of stored mechanical energ... | 07/20/1976 |
