Patents by Inventor Raymond Lippmann

Raymond Lippmann 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).

  • Stable brightness vacuum fluorescent display
    Patent number: 4859912
    Abstract: To avoid non uniform brightness or flickering of a vacuum fluorescent display especially at low brightness levels anodes energizing pulses sent to each end of the display are coordinated with the AC filament current so that successive pulses or group of pulses are initiated at opposite phases of the filament current at sufficiently high rates to time average the light variations of a critical flicker fusion period to obtain uniform perceived display brightness.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: August 22, 1989
    Assignee: General Motors Corporation
    Inventors: Raymond Lippmann, James E. Nelson
  • High voltage protection device with a tape covered spark gap
    Patent number: 4586105
    Abstract: To protect a load circuit on a printed circuit board, a pair of input circuit conductors are placed close together to form a spark gap. A load limiting resistor is placed in one of the conductors. A tape with adhesive around its perimeter is secured to the circuit board over the spark gap to trap air or other gas at the spark gap. A conformal coating covers the circuit board including the tape and the resistor.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: April 29, 1986
    Assignee: General Motors Corporation
    Inventors: Raymond Lippmann, James R. Chintyan