Patents by Inventor James Edwin Hinkle

James Edwin Hinkle 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).

  • Operator supervisory circuit for a key telephone system
    Patent number: 4029909
    Abstract: A switching arrangement coupled to an operator's subset, a called party's subset, a source of key system positive ground, a supervisory indicator lamp and a line button lamp operates to light the indicator lamp when the operator's subset is taken off-hook to answer an incoming call, to cause the line button lamp to wink when the operator's subset is placed on hold to disperse the incoming call to a called party's subset, to extinguish the indicator lamp and the line button lamp wink when the called party's subset is taken off-hook and to cause the line button lamp to again wink when the called party's subset is placed on hold after the called party's subset has been taken off-hook.
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: June 14, 1977
    Assignee: International Telephone and Telegraph Corporation
    Inventor: James Edwin Hinkle