Patents by Inventor Lloyd E. Clark

Lloyd E. Clark 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).

  • Patent number: 4598179
    Abstract: A telephone privacy system provides audible melodies identifying respective authorized callers without requiring the system user to answer the phone. A first ringing signal burst on the user's telephone line actuates the telephone ring circuit to announce an incoming call. The second burst places the phone off-hook and returns simulated audible ringing signal to the line so that unauthorized callers are not aware that calls are being screened. The simulated audible ringing signal also serves as an entry request to authorized callers who dial in their identification code after the first burst of simulated audible ringing signal. The entered code activates a tune generator to provide the called party with the caller-identifying melody. A visual indicator is provided to register visible indicia representing authorized calling parties.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: July 1, 1986
    Assignee: Sakura Telecommunications, Inc.
    Inventors: Lloyd E. Clark, Ralph E. Emery