| Patent Number |
Title Of Patent |
Date Issued |
| RE29080 |
Compensated transformer circuit utilizing negative capacitance simulating circuit |
December 14, 1976 |
| A circuit for reducing or eliminating the effect of the stray capacitance of the windings of a transformer on signals coupled through that transformer. Circuitry is provided for generating voltages and currents which simulate the presence of a negative capacitance and for coupling th |
| 4285023 |
Rectifier system with failure alarm circuitry |
August 18, 1981 |
| A rectifier unit for supplying power to a D.C. load including a transformer having a primary, a secondary and a saturable core, the secondary defining an output section and a control section. A ferroresonance control circuit simulates saturation of the transformer core and includes an el |
| 4268898 |
Semiconductor switching circuit with clamping and energy recovery features |
May 19, 1981 |
| A circuit for holding the voltage across a rapidly switched semiconductor element such as a transistor used in an inductive circuit to substantially twice the voltage of an input source when the element is switched to its nonconducting state. Also included is circuitry for recovering and |
| 4204266 |
Inverter drive circuit |
May 20, 1980 |
| An inverter drive circuit is disclosed wherein the inverter is a pulse width modulated inverter. The inverter includes a regulator circuit to regulate the width of the pulses which control the conduction of first and second controllable semiconductors in the inverter. The regulator is |
| 4192974 |
Multi-section apparatus for improving signal transmission through telephone transmission lines |
March 11, 1980 |
| An apparatus for providing simultaneously a multiplicity of independent non-interactive effects on the transmission characteristics of a voice-frequency telephone transmission line. Output voltage and current signal processing circuitry is provided which generates voltages for insert |
| 4192007 |
Programmable ringing generator |
March 4, 1980 |
| An apparatus for generating a selected one of a plurality of ringing frequencies utilizing a single frequency source. A first counting means is utilized to divide the source frequency by a first predetermined integer to generate a series of address signals at a rate proportional to the |
| 4130735 |
Loop extender |
December 19, 1978 |
| A loop extender for adding a series-aiding boost voltage to a subscriber loop of a telephone system and having a d.c. boost voltage supply, an amplifier circiit having an active device connecting the voltage supply in series with a conductor of said loop for applying to the loop a magnit |
| 4061883 |
Repeater for transmission lines of differing lengths |
December 6, 1977 |
| A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the a-c losses of that transmission line. Gain control circuitry is provided which varies the magnitude of amplifying voltages and currents inserted into the tra |
| 4054942 |
Tip automatic number identification circuit |
October 18, 1977 |
| A circuit for identifying which one of two parties has initiated a toll call. Circuitry connected to the subscriber drop of one party, e.g., the tip party of a two-party telephone line, generates a ground mark during the toll ticketing condition when that tip party has initiated a toll |
| 4037066 |
Repeater for transmission lines |
July 19, 1977 |
| A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the length of that transmission line. Circuitry is provided which establishes a control signal which is a function of the a-c losses of the transmission line. Th |
| 4032726 |
Repeater for transmission lines of differing lengths |
June 28, 1977 |
| A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the a-c losses of that transmission line. Gain control circuitry is provided which varies the magnitude of amplifying voltages and currents inserted into the tra |
| 4030017 |
Controlled reactance regulator circuit |
June 14, 1977 |
| A circuit for providing a regulated a-c or d-c output voltage from an unregulated a-c input voltage. A series inductance is connected between the regulator input and the regulator output to support the difference in voltage between the unregulated a-c input voltage and the regulated a-c |
| 3989907 |
Repeater for transmission lines of differing lengths |
November 2, 1976 |
| A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the a-c losses of that transmission line. Gain control circuitry is provided which varies the magnitude of amplifying voltages and currents inserted into the tra |
| 3989906 |
Repeater for transmission lines |
November 2, 1976 |
| A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the length of that transmission line. Circuitry is provided which establishes a control signal which is a function of the a-c losses of the transmission line. Th |
| 3983469 |
Controlled reactance regulator circuit |
September 28, 1976 |
| A circuit for providing a regulated a-c or d-c output voltage from an unregulated a-c input voltage. A series inductance is connected between the regulator input and the regulator output to support the difference in voltage between the unregulated a-c input voltage and the regulated a-c |
