Patents by Inventor John R. Kessinger

John R. Kessinger 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).

  • Bipolar tracking current source/sink with ground clamp
    Patent number: 5465041
    Abstract: A system for controlling a bipolar constant current when the current is being supplied to an active or reactive element. Tracking is extended to either sink or source modes. A switchable driven ground state is also provided. An operational amplifier buffer senses the voltage amplitude at the junction of the system output and active or reactive load element. This relatively low impedance output is summed or offset with a regulated voltage. This level is again buffered to present a low output impedance and series connected with a current limiting resistor.
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: November 7, 1995
    Assignee: Penberthy, Inc.
    Inventors: Gary G. Sanders, John R. Kessinger