Patents by Inventor Frederick D. Montano

Frederick D. Montano 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 protection circuit
    Patent number: 4947426
    Abstract: A protection device is provided for a telephone having a two wire subscriber line and an earth line. The protection device comprises a single surge protection device connected between a bridge rectifier polarity guard and the remainder of the telephone circuitry, which is connected to the output of the polarity guard. Three diodes are used to interconnect the earth line and the pair of output lines from the polarity guard to the surge protection device in such a way as to prevent surges from being fed to the remainder of the telephone circuitry. The surge paths including one or two arms of the polarity guard.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: August 7, 1990
    Assignee: Standard Telephone and Cables Pty, Ltd.
    Inventor: Frederick D. Montano