Patents by Inventor David Charles Anthony Connolly

David Charles Anthony Connolly 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).

  • Electric impulse transmitters for telephone instruments
    Patent number: 3932707
    Abstract: An electric circuit in an electric impulse transmitter which is responsive to the cessation of line current, except during loop-break impulses, to provide a clearing signal for storage circuits of said impulse transmitter.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: January 13, 1976
    Inventors: David Charles Anthony Connolly, Per Jorgen Hovland