Patents by Inventor Robert P. Dimmer

Robert P. Dimmer 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).

  • Electronic tone ringer
    Patent number: 3965307
    Abstract: An electronic tone ringer for use in telephone subsets. Operating in response to and powered from incoming received ringing signals, the ringer circuitry provides audible multitone signals. The circuitry employed eliminates so-called "bell tapping" or "chirping" during dialing.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: June 22, 1976
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Robert P. Dimmer