Patents by Inventor Robert J. Wolstein

Robert J. Wolstein 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).

  • Guitar pickup and switching apparatus
    Patent number: 5136919
    Abstract: Stringed instrument pickup and active switching circuitry that provide improvements in pickup sound combination, hum rejection and overall electronic function. The circuit employs plural pickups, a selected combination of which may be selected by a rotary switch. A latching device controlled by the switch outputs then produces a combination of control outputs to energize selected different FET switching devices to enable pickup signal outputs. Combined pickup signal outputs are then mixed and buffer amplified in a final output stage.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: August 11, 1992
    Assignee: Gibson Guitar Corp.
    Inventor: Robert J. Wolstein