Patents by Inventor William Heetderks

William Heetderks 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).

  • Suspended carrier modulation of high-Q transmitters
    Patent number: 5697076
    Abstract: A method for on-off modulation of a transmitter coil current of a high-Q resonant circuit transmitter comprising the steps of sensing a zero-crossing of the transmitter coil current and substantially instantaneously interrupting the transmitter coil current, and a high-Q resonant circuit transmitter for carrying out said method.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: December 9, 1997
    Assignees: Illinois Institute of Technology, United States of America as represented by the Department of Health and Human Services
    Inventors: Philip R. Troyk, William Heetderks, Martin Schwan, Gerald Loeb