Patents by Inventor Jerry L. Falk

Jerry L. Falk has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4071879
    Abstract: Apparatus for producing a reversible local battery current to provide metering pulses on a two-wire telephone trunk circuit. A DC current supply produces a current of one polarity which is increased from zero to 20 milliamps over a period of 75 milliseconds by charging a capacitor, and decreased from 20 milliamps to zero also over a period of 75 milliseconds by discharging the capacitor. The DC current supply is coupled to the trunk circuit by way of a polarity reversing bridge. In response to a control signal initiating a metering pulse, control circuitry causes the capacitor to discharge, gradually reducing the DC current through the trunk circuit to zero. When the current reaches zero, the control circuitry causes the polarity reversing bridge to reverse the connections of the DC current supply to the trunk circuit. At the same time the capacitor charges, gradually increasing the DC current through the trunk circuit.
    Type: Grant
    Filed: November 19, 1976
    Date of Patent: January 31, 1978
    Assignee: GTE Sylvania Incorporated
    Inventor: Jerry L. Falk