Patents by Inventor Clay E. Hagan

Clay E. Hagan 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 apparatus with conditional operation
    Patent number: 5267306
    Abstract: A dial controllable conditionally operative device which is directly connectable to the ring and tip lines of a subscriber loop. "On-hook" coupling is provided to allow the device to provide the conditional operation of one or more of the functional capabilities of a standard telephone. The device is usable in parallel with at least one standard telephone to provide a controlled telephone system. The device may also be usable in an intercommunication system using the ring and tip lines of the subscriber loop.
    Type: Grant
    Filed: April 19, 1991
    Date of Patent: November 30, 1993
    Inventor: Clay E. Hagan