Patents by Inventor Ian T. Cosgrove

Ian T. Cosgrove 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).

  • Telephone instrument
    Patent number: 4731831
    Abstract: Featurephone III Provides a line powered loud speaking telephone which meets BSI standards for current drain.To maintain the instrument at a fixed position on a V/I curve a constant current drain is provided across the line form which the instrument amplifier is fed. Accordingly, regardless of amplifier power requirement variations, current drain from the line is constant.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: March 15, 1988
    Assignee: Plessey Overseas Limited
    Inventors: Ian T. Cosgrove, Derrick Bent