Patents by Inventor Orland L. Davis, Jr.

Orland L. Davis, Jr. 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).

  • Key system protective apparatus
    Patent number: 4194093
    Abstract: A circuit for apparatus to be used with a key system line card for providing electrical isolation between the line circuit and the central office. The adapter responds to ring current from the central office to close a path to the line circuit to cause the line circuit to respond. The circuit provides two-way supervision responding to change of conditions either at the station or at the central office, and also provides a time delay to prevent the circuit from entering the hold condition improperly.
    Type: Grant
    Filed: November 29, 1978
    Date of Patent: March 18, 1980
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Orland L. Davis, Jr., Charles E. Moore, Jr.