Patents by Inventor Christopher O. Colvis

Christopher O. Colvis 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).

  • Dual mode amplifier network having an isolator in a digital path and a filter in an analog path
    Patent number: 5673287
    Abstract: The dual mode amplifier network of the present invention enables a radiotelephone to operate efficiently in both the U.S. Digital Cellular mode and the FM analog cellular mode. Multiple, switched branches (110 and 120) permit one branch (110) with an isolator (103) to be used in the in the U.S. Digital Cellular mode while the other branch (120) is switched out. In the analog mode, the transmit filter branch (120) is used while the isolator branch (110) is switched out.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: September 30, 1997
    Assignee: Motorola, Inc.
    Inventors: Christopher O. Colvis, Dale G. Schwent, Donald M. Yochem