Patents by Inventor Yan S. Lee

Yan S. Lee 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).

  • Body stimulator having selectable stimulation energy levels
    Patent number: 4340062
    Abstract: A body implantable stimulator for providing stimulation signals having selectable energy levels. The stimulator provides a series of one of a predetermined plurality of independent output initiate signals and responds to those signals to provide stimulation signals having an amplitude, duration and repetition rate established by the series of output initiate signals that is provided.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: July 20, 1982
    Assignee: Medtronic, Inc.
    Inventors: David L. Thompson, Ray S. McDonald, Yan S. Lee, Marc T. Stein
  • Battery depletion monitor
    Patent number: 4313079
    Abstract: A CMOS inverter is used to compare pacemaker battery voltage to a referenced voltage. When the reference voltage exceeds the measured battery voltage, the inverter changes state to indicate battery depletion.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: January 26, 1982
    Assignee: Medtronic, Inc.
    Inventor: Yan S. Lee