Patents by Inventor Edward W. Carmichael

Edward W. Carmichael 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).

  • Self-contained, clip-on engine operating time log
    Patent number: 5337003
    Abstract: A self-contained, clip-on engine operating time log comprises a case containing circuitry for monitoring the accumulated operating time of a spark ignition engine. A plastic sensor, rigidly extending from the case, has two semi-cylindrical channels for clipping the time log directly onto an ignition wire of the engine. The sensor and the circuitry detect spark impulses in the ignition wire for determining the operating time of the engine. A liquid crystal display, visible through a window of the case, digitally displays the accumulated operating time.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: August 9, 1994
    Inventors: Edward W. Carmichael, Robert B. Legge