Patents by Inventor Peter L. Edwards

Peter L. Edwards 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).

  • Telecommunication receivers
    Patent number: 4431872
    Abstract: A DTMF telecommunication receiver in which an additional DTMF receiver circuit is provided tuned to a particular pair of tones. Detection of the particular tones opens a switch in the audio output line and eliminates crosstalk in the hybrid circuit making detection of further DTMF tones less likely to error.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: February 14, 1984
    Assignee: International Business Machines Corp.
    Inventors: Peter L. Edwards, Barry Ward