Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7348826 | Composite field effect transistor A composite field effect transistor, in accordance with one embodiment, includes a zener diode, a junction field effect transistor and a metal-oxide-semiconductor field effect transistor. A gate of the junction field effect transistor is coupled to an anode of the z... | 03/25/2008 |
| 6859088 | Ferroelectric element and a ferroelectric gate device using the same A ferroelectric gate device which comprises a ferroelectric capacitor (1), a switching element (2) serving as a resistor of a capacitor depending on the voltage applied, and a field-effect transistor (6) having a source, a drain and a gate, said... | 02/22/2005 |
| 5747836 | Semiconductor integrated circuit provided with thyristor A dV/dt clamp circuit is connected to a base of a phototransistor for triggering a control electrode of a thyristor, thereby making an attempt to prevent an operation error. A control electrode voltage of the thyristor is applied to the gate of the MOSFET... | 05/05/1998 |
| 5631588 | Power output stage with limited current absorption during high-impedance phase A power stage of quasi-complementary symmetry, including a common-source FET and a common-drain FET, with a reduced absorption of current under the conditions of high impedance of the output. The driving node of the upper (common-drain) transistor from is... | 05/20/1997 |
| 5602505 | Gate drive circuit In one aspect of the present invention a gate drive circuit is disclosed. The gate drive circuit includes a high voltage and low voltage energy source, a power transistor, a switching transistor, and a charging capacitor. The charging capacitor stores ene... | 02/11/1997 |
| 5545914 | Semiconductor device having zener diodes with temperature stability between base and collector regions A plurality of Zener diodes are connected between two electrodes of a transistor as the protector of the transistor to obtain a predetermined breakdown voltage. Each Zener diode has a breakdown of 5 V whose temperature coefficient is substantially zero.... | 08/13/1996 |
| 5495198 | Snubbing clamp network A snubbing clamp network (14) is disclosed which comprises a gate voltage clamp (16) having an input and an output, the output connected to a first node, a gate-source voltage clamp (18) having an input connected to the first node and an output connected ... | 02/27/1996 |
| 5481219 | Apparatus and method for generting negative bias for isolated MOSFET gate-drive circuits An isolated MOSFET gate drive includes circuitry to provide a negative gate bias during the off time of the MOSFET to enhance its immunity to inadvertent turn-on. The bias is generated by a self contained two terminal passive network which may be "floated... | 01/02/1996 |
| 4803418 | In-line electrical switch for AC power supply A proximity switch e.g. for a domestic a.c. supply is connected in-line e.g. in the live line of the supply between live and switch live terminals. No direct connection is made to the neutral line. Switching is performed by a triac T which receives a gate... | 02/07/1989 |
| 4792838 | Gate turn-off thyristor In a gate turn-off thyristor including two separate gate electrodes, a first turn-off gate signal is applied to the first gate electrode and then a second turn-off gate signal is applied to the second gate electrode after a predetermined time has elapsed ... | 12/20/1988 |
| 4763028 | Circuit and method for semiconductor leakage current compensation Circuitry and method for compensating for the junction leakage current of a reverse-biased semiconductor device. Compensation is effected by trimming the leakage of a compensating device at a high temperature in order to accurately compensate the leakage ... | 08/09/1988 |
| 4748533 | Integrated circuit for the protection of subscriber lines against overvoltages An integrated circuit for protecting subscriber lines against overvoltages includes a semiconductor body; a field-controllable thyristor having a gate electrode, an anode electrode and a cathode electrode, the gate electrode being insulated from the semic... | 05/31/1988 |
| 4739199 | High switching speed semiconductor device A semiconductor device comprising first and second transistors connected in series with one another to pass a primary current upon receipt of a control signal at the gate of the second transistor. The first transistor is coupled to receive a base current ... | 04/19/1988 |
| 4734012 | Blower speed control A speed controlling circuit for an alternating current powered blower motor is disclosed in which rectified direct current voltages are manipulated, regulated responsive to ambient temperature, and compared so as to provide reliable and cost effective blo... | 03/29/1988 |
| 4728826 | MOSFET switch with inductive load The voltage peaks occuring upon disconnection of inductive loads are normally attenuated by a by-pass diode connected in parallel with the load. The driving countervoltage is thereby limited to the value of the forward voltage drop of the diode. For a pow... | 03/01/1988 |
| 4717996 | Gated parallel power switching devices protection circuit Two or more gated type power switches, particularly mosfets, are disclosed in a protection circuit which protects the other power switches should one of them short to its respective gate. The circuit includes elements for sensing the occurrence of the fai... | 01/05/1988 |
| 4710949 | Telephone line fault locating device A fault locating device for determining whether a problem exists on the customer side or the office side of a telephone line. A voltage and current sensitive switch is connected in series with each of the ring and tip lines near the customer side. The vol... | 12/01/1987 |
| 4653084 | Remote actuated switch A solid state remotely actuable switch is described for testing and remotely disconnecting a circuit. In one embodiment, a solid state bilateral switch such as a triac is connected in series with the remote circuit, and a trigger device such as a diac is ... | 03/24/1987 |
| 4634957 | Remotely controlled light flasher A control circuit for selecting different modes of operation for an outside building light which is operated by interrupting the current to the control circuit from a standard wall switch. The First mode of operation is continuous light for normal use. The sec... | 01/06/1987 |
| 4626632 | Maintenance termination unit An improved and simplified voltage sensitive switching unit for opening a telephone subscriber pair at the line of demarcation for purposes of conducting line tests of the pair from the telephone central office to determine the state of the line. Relative... | 12/02/1986 |
| 4621448 | Fishing apparatus A multiple fishing line apparatus which comprises an upper frame and a lower frame, both upper and lower frames substantially in a horizontal position having a central post extended therebetween. There would be further provided a plurality of outer arm me... | 11/11/1986 |
| 4612448 | Electronic switch Connected in series with a thyristor (1) are two IGFETs (2, 3) one to the anode side and the other to the cathode side. Between the inner thyristor zones (6, 8) and the outer IGFET connections, a threshold circuit (10, 11) is connected to each. The thresh... | 09/16/1986 |
| 4599555 | Solid state DC power control system A solid state DC power control system having a single N-type or N-channel or majority carrier solid state switching element (Q1) connected to the high side (L) of the power supply for energizing a ground or neutral (Vo) connected load (LD). A v... | 07/08/1986 |
| 4521736 | Demodulator for pulse width modulated signals A simple demodulator circuit for demodulating high frequency pulse width modulated carrier signals, includes means for charging a capacitor to charge levels commensurate with the pulse widths. Output switch means, biased at the verge of conduction, discha... | 06/04/1985 |
| 4443719 | Voltage isolated gate drive circuit A voltage isolated gate drive circuit for insulated gate semiconductors utilizes a small, inexpensive pulse transformer to provide a rectangular drive wave form. The small pulse transformer can be operated with an input square wave form at relatively low ... | 04/17/1984 |
| 4367421 | Biasing methods and circuits for series connected transistor switches In one embodiment of the invention, a switching circuit is provided by connecting the main current paths of a plurality of relatively low voltage transistors in series for switching a relatively high level of voltage, with zener diodes being connected acr... | 01/04/1983 |
| 4360740 | Low voltage switching circuit for controlling a high voltage electrical load Solid state high voltage electronic switching means, preferably a triac, is connected in series with a high voltage load, for instance, a light, across a high voltage alternating current power source. Contacts of a relay having a low voltage coil are oper... | 11/23/1982 |
| 4350949 | Bidirectional switching circuit with control terminal A switching circuit whose current-to-voltage characteristic across a first terminal and a second terminal is a bidirectional and symmetrical breakdown characteristic, and arranged especially so that said breakdown voltage will vary in accordance with the ... | 09/21/1982 |
| 4325099 | Detector circuit for thyristors A detector circuit (102) is connected to the gate of a thyristor (103) for generating an output signal indicating the presence of current flowing out of the cathode of the thyristor. A switch circuit (101), which is responsive to a control signal, selecti... | 04/13/1982 |
| 4323942 | Solid-state protector circuitry using gated diode switch A solid-state protector circuit utilizes the combination of two zener diodes (Z1, Z2), a resistor (R1), a capacitor (C1), and a gated diode switch (GDS) to facilitate the rapid discharge of high voltage transients.... | 04/06/1982 |
| 4322767 | Bidirectional solid-state protector circuitry using gated diode switches An all solid-state protector circuit utilizes the combination of four zener diodes (Z1, Z2, Z3, Z4), two resistors (R1, R2), two capacitors (C1, C2), and two gated diode type switches (GDSA, GDSB) and provides bilateral voltage surge protection.... | 03/30/1982 |
| 4301351 | Modular microprocessor-controlled controller for resistance for resistance welding machines A precision resistance welding machine controller is provided which may be set to deliver welding power to each of a multiplicity of welding operations on a precisely controlled repeatable basis. The controller of the invention is modular in nature and is... | 11/17/1981 |
| 4271445 | Solid-state protector circuitry using gated diode switch A solid-state protector circuit utilizes the combination of two zener diodes (Z1, Z2), a resistor (R1), a capacitor (C1), and a gated diode switch (GDS) to facilitate the rapid discharge of high voltage transients.... | 06/02/1981 |
| 4270101 | Relaxation oscillator having switched current source Within a relaxation oscillator of the type having a capacitor that is recurrently charged from a current source and then discharged through a silicon controlled rectifier upon reaching a threshold voltage thereacross, a switch is disposed to interrupt cur... | 05/26/1981 |
| 4255699 | Phase modulated power control An apparatus for applying AC power to a load while maintaining a minimum charge across a capacitor for use as a DC power supply, that may be connected in series with the power supply and load, and does not require a parallel connection to the power supply... | 03/10/1981 |
| 4223281 | SCR Relaxation oscillator with current amplifier in its gate circuit Within a relaxation oscillator of the type having a capacitor that is recurrently being charged from a current source and then discharged through a silicon controlled rectifier upon reaching a voltage threshold thereacross, the current flow to the gate of... | 09/16/1980 |
| 4203052 | Solid state ignition system A solid state ignition system for generating high frequency and high energy electrical pulses, the system providing improved performance under varying line voltage conditions, improved voltage regulation, and reduced power dissipation, and being effective... | 05/13/1980 |
| 4181921 | Harmonic distortion attenuator A harmonic distortion attenuator in an AC power supply for reducing electrical energy consumption through the suppression of transient voltages in power supply lines or the like connected to the circuitry wherein a threshold voltage clamp, responsive to a... | 01/01/1980 |
| 4164664 | Control circuit for load-leveling shock absorbers A control circuit for an air-spring shock absorber controls pressurization or depressurization of the air chamber of the shock absorber in response to the output signal condition of a level sensor. The control circuit includes a first signal path that con... | 08/14/1979 |
| 4096400 | Inductive load driving amplifier An inductive load driving amplifier is disclosed which includes two serially connected transistors, with Zener diodes limiting the collector-emitter voltage of the one and diverting the collector-base current of the other when the first one switches off. ... | 06/20/1978 |
