Patents by Inventor Marvin L. Wahl

Marvin L. Wahl 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).

  • Tracking system using radio frequency signals
    Patent number: 5771002
    Abstract: A tracking system comprising multiple satellite units and a master unit for selectively and individually locating each satellite unit. Each satellite unit receives a search signal from the master unit and transmits a response signal to the master unit when the search signal contains a search identity code which matches a unique identity code of the satellite unit. The master unit has user controls for selecting any one of the satellite units to be located and a memory for storing the unique identity code of each satellite unit. The master unit also has an indicator circuit for indicating the strength of the response signal and a display and speaker for visually and audibly indicating the strength to a user. The master unit is programmed such that when the user selects one of satellite units to be located, the master unit transmits a search signal having a search identity code which matches the unique identity code of the selected satellite unit.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: June 23, 1998
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: William R. Creek, Marvin L. Wahl, Bryan L. Clausen, Sr., Mery Clausen, Bryan Clausen, Jr.