Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4668904 | Controlled source of current The invention relates to a controlled source of current (1) having an inductive load (3), particularly a gradient coil adaptable to a nuclear spin imaging assembly. In order to cut down the reversal time of a current flowing in the load, the circuit is pr... | 05/26/1987 |
| 4658198 | Charging circuit for a reference capacitor A charging circuit is provided to decrease the settling time of a reference capacitor storing a reference voltage for data acquisition circuits. The charging circuit includes one or more comparator circuits for comparing the voltage across the reference c... | 04/14/1987 |
| 4587437 | Coupling/decoupling capacitor multiplier The invention discloses an improved capacitor multiplier which can be applied in both floating coupling and in grounded decoupling applications.... | 05/06/1986 |
| 4567424 | Reactive power compensator with capacitor and capacitor discharge circuit In a reactive power compensator used for capacitive or inductive reactive powers in alternating-voltage networks, a capacitor is connected to an alternating-voltage network for a short time by means of a thyristor switch. In order to reduce the voltage lo... | 01/28/1986 |
| 4560914 | High voltage amplifier for capacitive load A controlled supply device for a capacitive load with high voltage signals includes a circuit that produces an alternate low voltage control signal, an input capacitor which displays a capacitance which is much lower than that of the capacitive load, a no... | 12/24/1985 |
| 4555655 | Charging/discharging circuit A charging/discharging circuit is formed of transistors Q1, Q2; resistors R1-R4; and a capacitor C. The series resistors R1, R2 are connected between the power supply line +Vcc and the circuit ground. The series resistors R3, R4 are connected between the ... | 11/26/1985 |
| 4524289 | Flash lamp power supply with reduced capacitance requirements A power supply circuit for a flash lamp delivers energy to the lamp in increments rather than in the conventional single charging pulse. A dc voltage power supply is used which has a voltage output considerably higher than the normal lamp voltage. The pow... | 06/18/1985 |
| 4485155 | Storage element for electrical energy An electric energy storage element having a housing and at least two ion pervious graphite electrodes connected by an ion-containing electrolyte. The storage element may be used as a secondary battery or as a condenser. During charging, the ionic componen... | 11/27/1984 |
| 4481426 | Signal transmitting system having spurious radiation preventing function A signal transmitting system including a spurious radiation preventing circuit which comprises a differentiating circuit coupled to a signal line connected to a signal source for differentiating an original signal for emphasizing high frequency components... | 11/06/1984 |
| 4384215 | Capacitor element A capacitor for use in microwave transistor, comprises a dielectric material layer and conductive layers covering both sides of the surfaces of the dielectric material layer. A plurality of points on the surface of one of the conductive layers are connect... | 05/17/1983 |
| 4329595 | AC Resonant charger with charge rate unrelated to primary power frequency An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant... | 05/11/1982 |
| 4321480 | Positive differential alternating current switching means A solid state switching circuit using a capacitive feedback that creates a positive differential. This positive differential overcomes any half-wave operation of the solid state switches caused by lack of symmetry in its gating circuit.... | 03/23/1982 |
| 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 |
| 4224564 | Statistical enhancement of the accuracy of a ratio-matched network in a circuit chip A statistically enhanced ratio-matched network in a circuit chip is disclosed. The network may be either a resistance network or a capacitance network. In a ratio-matched resistance network, such as an R-2R resistance ladder, a plurality of resistances in... | 09/23/1980 |
| 4189650 | Isolated trigger pulse generator A trigger pulse generation system capable of delivering a multiplicity of isolated 100 kV trigger pulses with picosecond simultaneity.... | 02/19/1980 |
| 4148091 | Electromagnetic force machine with universal portable power supply An electromagnetic force (EMF) machine with a universal portable power supply is disclosed. The universal portable power supply energizes either a multiple turn flux concentrator or a single turn flux concentrator. The flux concentrators produce magnetic ... | 04/03/1979 |
| 4027271 | Capacitor structure and circuit facilitating increased frequency stability of integrated circuits A stabilizing circuit which increases the effective value of a capacitor and the structure of a monolithic capacitor are disclosed. The stabilizing circuit includes a transistor having a base electrode connected to the capacitor and an emitter electrode c... | 05/31/1977 |
| 3987356 | Controlled capacitive filter for active loads A single phase controlled capacitive filter with a smaller, more efficiently used filter capacitor than conventional capacitive filters is connected between rectifier terminals and supplies voltage to an active load producing dc output voltage. The charge... | 10/19/1976 |
