Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 5523677 | DC current sensor A DC current sensor has a detecting core with a plurality of detecting core members adapted to be divided in a circumferential direction for receiving the lead wire. A pair of annular exciting cores on one of said detecting core members formed of saturabl... | 06/04/1996 |
| 5196784 | Isolated current monitoring circuit for measuring direct and high duty factor currents A method and circuit for measuring direct and high duty factor current in a conductor (1) with minimal interference with the operation of a monitored circuit. Current flow in the conductor is magnetically sensed with a transformer T1 having a primary wind... | 03/23/1993 |
| 5014181 | Magnetic amplifier package and method of cooling the same A magnetic amplifier package (1) comprises a diode rectifier (6) and a plurality of saturable reactors in the form of toroids (2) having cores (3), gate windings (4) and control windings (5). The diode rectifier and the saturable reactors are located with... | 05/07/1991 |
| 4899103 | Current meter A variable electrical current in a first winding on a magnetizable core produces a magnetomotive force in the core. A second core winding produces an opposing magnetomotive force digitally adjustable periodically by a third core winding, a pair of switche... | 02/06/1990 |
| 4823074 | Low power consumption current transducer A low power consumption current transducer utilizes a saturable core reactor which includes a pair of opposed gate windings and a control winding. The control winding of the saturable reactor is arranged to receive the current to be measured. A square wav... | 04/18/1989 |
| 4675615 | Magnetic amplifier A magnetic amplifier employing a single four-legged ferrite core having orthogonally disposed through holes in the core. Biasing is provided of the magnetic core so as to provide operation in the non-linear parts of the core's hysteresis cycle. A first co... | 06/23/1987 |
| 4482862 | Current sensor A current measuring system includes three toroidal magnetic cores. The first core has a non-linear B-H characteristic and being adapted for operation in and between its saturation ranges of its B-H characteristic. The second and third cores are adapted fo... | 11/13/1984 |
| 4417153 | High frequency switching circuit A single-ended switching circuit is constituted by a primary winding of a transformer, a switching circuit connected between the primary winding and a DC power supply and on-off operated with a predetermined cycle and also with a predetermined "on" period... | 11/22/1983 |
| 4377758 | Magnetic amplifying apparatus In an apparatus having a saturable magnetic core, a control winding wound on the magnetic core and supplied with a D.C. voltage in accordance with a desired phase angle, and an output winding wound on the magnetic core and supplied with an A.C. voltage th... | 03/22/1983 |
| 4286211 | Direct current detecting device using saturable reactors A direct current detecting device is disclosed in which two pairs of saturable cores are provided so as to enclose a conductor carrying a direct current to be measured. On each of the saturable cores, a bias winding, a feedback winding and an output windi... | 08/25/1981 |
| 4280064 | Signal isolator An improved signal isolator including two nonlinear circuits having nonlinear voltage-to-current characteristics, in which an input network is formed by connecting one of the nonlinear circuits in series with the primary winding of a transformer, and an o... | 07/21/1981 |
| 4272713 | Switching transconductance amplifier for inductive loads A switching current amplifier for stepping motors utilizing a square hysteresis loop transformer to measure the motor winding load current directly, to determine the high and low switching points in reference to the position command signal, to compare the... | 06/09/1981 |
| 4266190 | Dual core magnetic amplifier sensor A magnetic amplifier sensor for measuring the magnitude and polarity of a DC current flowing in a line includes a pair of saturable cores, each having a primary and secondary winding mounted thereon. The primary coils are connected in series and a portion... | 05/05/1981 |
| 4262259 | Low current linearization of magnetic amplifier for DC transducer A magnetic amplifier having two saturable reactor cores with a separate excitation winding on each connected in series opposition, a common control winding and a common output winding, is adapted for use as a low level signal transducer by exciting the se... | 04/14/1981 |
| 4171510 | System for detecting output of controllable semiconductor device A system for detecting an output of a controllable semiconductor device includes a controllable semiconductor device, a magnetic amplifier to which an output of the semiconductor device is fedback to control the semiconductor device, and a monitor device ... | 10/16/1979 |
| 4163191 | Magnetic phase shifter control system A magnetic phase shifter control system comprises a magnetic phase shifter for producing an output signal in accordance with a control command at a predetermined amplification degree, a circuit for suppressing the output signal of the magnetic phase shift... | 07/31/1979 |
| 4155034 | Saturable reactors with feedback A control circuit comprises two series-connected pairs of saturable reactors, the two pairs being connected in parallel between a supply line and a load. Between one pair of reactors are connected two back-to-back diodes, the center tap of which is connec... | 05/15/1979 |
| 4092607 | Magnetic amplifier having a co-axial winding A magnetic amplifier having a magnetic core in the shape of a hollow cylinder is provided with a gate winding comprising series-connected coaxial conductors passing through the center of the hollow core.... | 05/30/1978 |
| 4000473 | Isolation amplifier Disclosed is an isolation amplifier, wherein a DC input signal is applied to the primary winding of a saturable reactor, the secondary winding of which is coupled with an oscillating circuit so as to supply the secondary circuit with a high-frequency curr... | 12/28/1976 |
