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| Number | Title | Issue Date |
| 7357359 | Electronic code follower relay An electronic code following relay for use in a railroad signaling system includes a timing circuit for receiving an input square wave signal coded at a pre-determined code rate, and regenerating the input square wave signal at the pre-determined code rate after a p... | 04/15/2008 |
| 7173428 | Portable circuit interrupter shutoff testing device and method A portable circuit interrupter shutoff testing device and method, including a high current switch controlled by a timing circuit that allows current to flow through the switch and a small series resistance (in order to trip the instantaneous-trip function of the int... | 02/06/2007 |
| 7009829 | System, apparatus, and method for controlling lamp operation when subject to thermal cycling A system, apparatus, and method for preventing thermal cycling of a ballast coupled to one or more lamps. A monitor circuit is provided to monitor for activation of the ballast's thermal protection mechanism. Such monitoring may include monitoring of the ballast's t... | 03/07/2006 |
| 6980894 | Method of managing interference during delay recovery on a train system The present invention provides methods for preventing low train voltages and managing interference, thereby improving the efficiency, reliability, and passenger comfort associated with commuter trains. An algorithm implementing neural network technology is used to p... | 12/27/2005 |
| 6929465 | Timer circuit for valve activation in oil burner system The present invention is directed to an oil burner system having an electric cord set coupled between a controller and a valve associated with a pump. The electric cord set is operable to activate a solenoid valve associated with the pump for delivery of fuel oil to... | 08/16/2005 |
| 6724287 | Electromagnet In an electromagnet (10) having a magnet coil (13), which has an exciter winding (23) wound from an insulated winding wire (24), having a magnet core (14), having a movable armature (16) opposite the magnet core (14),... | 04/20/2004 |
| 4959746 | Relay contact protective circuit A contact protective circuit for a relay detects a transient in the relay operating coil and turns on a low resistance power MOSFET in shunt relation with the contacts before the contacts close or open whereby arcing or deposition of metal on the contract... | 09/25/1990 |
| 4774527 | Printhead having electrodes at more than one edge surface A printhead of a resistive ribbon printer has a column of electrodes formed on each of at least two edge surfaces. When the column of electrodes at one edge surface is worn out after being used for printing, the printhead is rotated so that the column of ... | 09/27/1988 |
| 4642726 | Solenoid operator circuit for molded case circuit breaker A molded case circuit breaker includes a solenoid control circuit for controllably energizing a solenoid to actuate a motor operator to automatically move a handle of the circuit breaker to change the operative condition of the circuit breaker. The contro... | 02/10/1987 |
| 4563721 | Circuit arrangement for actuating electromagnetic switchgear The invention relates to a circuit arrangement for actuating exciting coils for electromagnetic switchgear. A transistor is connected in series with the exciting coil, as an electronic switch. Parallel with the series connection are a capacitor and a cloc... | 01/07/1986 |
| 4533810 | Start circuit for microwave oven A start circuit arrangement for a microwave oven including a power control relay circuit which is independently responsive to a user actuable momentary start switch and to a programmed electronic controller to facilitate operation in a delay start mode. T... | 08/06/1985 |
| 4325101 | Vital electronic time delay circuit A fail-safe electronic time delay circuit for providing a predetermined time delay period having an emitter-follower amplifier connectable to a source of recurrent signals, a voltage doubling rectifier for rectifying the amplified recurrent signals and fo... | 04/13/1982 |
| 4298901 | Resistive controller A resistive controller suitable for sensing a variable electrical resistance indicative of a characteristic of a substance and for connecting an external electrical device to a source of electrical power when the measured electrical resistance reaches a p... | 11/03/1981 |
| 4215272 | Timer circuit with multiple time delay outputs A timer circuit is powered by an alternating current (AC) from an AC source which current is rectified to produce direct current (DC) and used to energize a power transistor connected between the DC source and in a load. A separate timing control circuit ... | 07/29/1980 |
| 4207501 | Lamp control circuit using heater/thermistor time delay A lamp control circuit having a heater and thermistor coupled between the illumination sensitive device and the control electrode of an SCR or triac for providing a time delay between the detection of a change in illumination and the switching of the SCR ... | 06/10/1980 |
| 4204242 | Time delay circuit for timing relays The invention is concerned with a time delay circuit for timing relays with operation by means of alternating potential with a rectifier, a programmable unijunction transistor and an RC network with a common junction point.... | 05/20/1980 |
| 4189665 | Irradiation apparatus The invention relates to a sun lamp provided with a timer circuit that includes a capacitor. As soon as the capacitor reaches a certain charge condition the sun lamp is switched-off. The sun lamp also comprises a safety circuit responsive to a given level of ... | 02/19/1980 |
| 4150417 | Fail-safe timing circuit This disclosure relates to a fail-safe timing circuit having a regulator which produces a regulated d.c. voltage when a switch is closed. A signal generator powered by the regulated d.c. voltage for producing square-wave signals. A two-stage amplifier for... | 04/17/1979 |
| 4138708 | Drive circuit for solenoid pump A drive circuit for a solenoid pump comprises a series combination of a pump solenoid and a capacitor connected through a rectifier circuit with an a.c. source. The solenoid is shunted by another rectifier poled to pass a charging current to the capacitor... | 02/06/1979 |
| 4092717 | Method and apparatus for stabilizing the through flow of electromagnetic injectors In order to stabilize the open time of an electromagnetic fuel injector against variation of vehicle battery voltage, first and second threshold values of solenoid current for opening and closing of the injector are predetermined experimentally, the durat... | 05/30/1978 |
| 4065096 | Solenoid-actuated valve Solenoid-actuated valve adapted for heavy duty use by having the coil of the solenoid divided into high and low power windings connected in and automatically energized in succession by a solid state control circuit for providing in sequence high power of ... | 12/27/1977 |
| 4059845 | Fail-safe time delay circuit A fail-safe time delay circuit comprising a detection relay for sensing the presence and absence of an input signal, a switching relay for assuming a first and a second condition in accordance with the presence and absence of the input signal, and a progr... | 11/22/1977 |
| 3965398 | Intermittent load energizer assembly and circuit means An intermittent electrical load energizer assembly employs a solid state electrical timing circuit having a unijunction transistor and an output stage comprising additional transistor means for, in turn, energizing and de-energizing related coil means for... | 06/22/1976 |
| 3939384 | Electric timer switch An electronic timer switch capable of controlling the operation of a unit, such as an air conditioning apparatus, according to a preset time schedule even when the unit is switched on.... | 02/17/1976 |
