Patents by Inventor Eric E. E. Vanderheyden

Eric E. E. Vanderheyden 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).

  • Variable timing circuit for card readers and the like
    Patent number: 4158436
    Abstract: A circuit is disclosed for use in magnetic card readers to compensate for variations in card speed as a card moves under a read head. The subject circuit decodes two frequency coherent phase encoding. This self clocking binary code incorporates the presence or absence of pulses (or transitions of voltage levels) within periodic intervals or bit cells as a representation of a logic 1 or a logic 0 respectively.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: June 19, 1979
    Assignee: AMP Incorporated
    Inventor: Eric E. E. Vanderheyden