Patents by Inventor Robert J. Donahue

Robert J. Donahue 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).

  • Level selective a-c monitoring circuit
    Patent number: 4217506
    Abstract: The present invention provides a circuit for monitoring an a-c input signal to determine if the signal level falls within a selectable level range.
    Type: Grant
    Filed: May 17, 1978
    Date of Patent: August 12, 1980
    Assignee: Northern Telecom, Inc.
    Inventors: Robert E. Sawyer, Jr., Robert J. Donahue