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| Number | Title | Issue Date |
| 4578734 | Electronic circuit controlling a multiple operation apparatus fitted with an electromagnetic mechanism The invention relates to an electronic device controlling the electromagnet of a multiple operation electrical apparatus. The electromagnetic coil (14) is connected in series to a triac (25) regulated by a generator (32) associated with a monostable flip-flop ... | 03/25/1986 |
| 4537850 | Process and apparatus for rejuvenating electrostatic copy machine toner A method and apparatus for rejuvenating magnetic toner used in certain electrostatic copying machines. The used toner is placed in a container which is inserted in an air coil which is energized to produce a magnetic field which remagnetizes the toner. Th... | 08/27/1985 |
| 4502090 | Protective control system for engine A protective control system is provided for stopping an engine-driven pump when a fault condition such as low oil level, low oil pressure or high temperature occurs in the engine. The protective control system includes an electric battery, a solenoid valv... | 02/26/1985 |
| 4500937 | Control circuit for a solenoid driver for a dispenser A control circuit for a solenoid driver for a dispenser having inherent pull-in and drop-out delays. The circuit includes a tachometer that generates pulses representative of the speed of a conveyor that conveys a substrate upon which the dispenser dispen... | 02/19/1985 |
| 4500938 | Fastener driving device A fastener driving device such as a tacker, including an actuating circuit for producing a power stroke for substantially a complete half cycle of an AC potential supply and which occurs a fixed number of cycles following the actuation of a switch actuabl... | 02/19/1985 |
| 4485342 | Load driving circuitry with load current sensing A testable load driving circuit apparatus includes a solid-state load driver for controlling AC current loads coupled in series with a winding of a saturable core reactor used for sensing the presence or absence of load current through a load current moni... | 11/27/1984 |
| 4485425 | Drive circuit for printer, particularly, matrix printer of the needle or hammer variety The drive circuit for an electromagnetic actuator for the impact element in a printer includes a series circuit of a drive transistor and of a switching transistor there being a reference resistor interposed which together with a Zener diode serves as a c... | 11/27/1984 |
| 4470095 | Coil excitation arrangement for producing a pulse-shaped field of constant intensity An embodiment of the present invention provides an excitation arrangement suitable for use in producing a pulse-shaped field of substantially constant intensity. To start-up the current at the beginning of a pulse, a coil (1) is fed with a high voltage (l... | 09/04/1984 |
| 4454558 | Solenoid drive circuit A solenoid drive circuit for a matrix printer comprises a capacitor (C1) connected in parallel with the series arrangement of a first diode (D2), the solenoid coil (L1), and the collector-emitter path of a transistor (T1). A second diode (D3) is connected... | 06/12/1984 |
| 4433357 | Drive circuit for a latching relay A drive circuit for a latching relay includes a flip-flop, a timer and a semiconductive switching circuit for the relay. First and second input signals are applied to the flip-flop and first and second control signals at the output of the flip-flop are ap... | 02/21/1984 |
| 4360855 | Injector drive circuit An injector drive circuit in which the injector is opened in response to a pulse signal with a time width which determines the quantity of the fuel to be supplied to the engine. To the injector, a circuit for supplying a peak current at the time of fuel i... | 11/23/1982 |
| 4359652 | Over voltage detection circuit for use in electronic ignition systems An over voltage detection circuit for utilization in conjunction with a series driver transistor type electronic ignition system which samples the voltage magnitude appearing at the collector of the series driver transistor to render the same nonconductiv... | 11/16/1982 |
| 4255775 | Electrostatic precipitator rapper control system with enhanced accuracy A comprehensive multiple rapper control system controls rapping intensity with enhanced accuracy, controls a large number of rappers in any desired sequence with intensity control for each individual rapper, and includes alarm circuitry for reliably indic... | 03/10/1981 |
| 4242714 | Current control circuit In a circuit for controlling the current flow through a coil, such as the horizontal deflection coil of a television receiver, a first switching device including, for example, a first switching transistor and a first damper diode is connected in parallel ... | 12/30/1980 |
| 4071877 | Drive circuit A circuit provides means for driving a load under control of a plurality of signals including a drive timing signal which is given a maximum permissible duration by the circuit to prevent damage to the load, an operating signal, and an inhibit signal whic... | 01/31/1978 |
| 4015174 | Devices for magnetic control with permanent magnets A magnetic device comprising two permanent magnets, armature members forming with said magnets a closed magnetic circuit and an external air gap, and means for reversing the direction of magnetization of one of the magnets, whereby the flux is prevented t... | 03/29/1977 |
| 4008420 | Switchable high-frequency magnetic rotary fields An arrangement for the production of a magnetic rotary field with the help of a crossed coil pair of separate capacitance connected across each of said coils to form respective parallel resonant circuits each of which is in series with a timing circuit, a... | 02/15/1977 |
| 3946285 | Solenoid control system with cusp detector A solenoid control system wherein the duration of actuation of a solenoid is a function of the workload imposed thereon so that the current to the solenoid is always turned off as soon as the solenoid plunger or armature is seated. Solenoid control logic ... | 03/23/1976 |
| 3936706 | Control circuit A control for supplying not more than one complete cycle of an alternating current upon command. The circuit has a plurality of gate controlled switching devices and a command switch. An energy storage device has one of the switching devices connected in ... | 02/03/1976 |
