Patents by Inventor Graig A. Gemmer

Graig A. Gemmer 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).

  • Broadband communications RF packet collision detection
    Patent number: 4939510
    Abstract: A method and apparatus for identification of packet collisions which occur on a broadband communication bus. The collision detection apparatus is responsive to signals which normally reside on an RF packet channel. This apparatus identifies a collision by splitting a packet signal and then multiplying the split signal by itself utilizing a conventional mixer. The multiplied signal is passed through a bandpass filter and if no packet collision has occurred, then no significant signal energy will appear at the output of the bandpass filter. Howerever, in the event of a packet collision, then the multiplied output signal includes frequency components which pass through the bandpass filter to produce an energy level which is identified in a threshold detector.
    Type: Grant
    Filed: November 7, 1989
    Date of Patent: July 3, 1990
    Assignee: E-Systems, Inc.
    Inventors: Michael S. Masheff, Graig A. Gemmer