Patents by Inventor Martin G. Rudroff

Martin G. Rudroff 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).

  • Hands-free answer arrangement on intercom for key telephone system
    Patent number: 4158112
    Abstract: An intercom arrangement in a key telephone system is disclosed that permits the answering of intercom calls "hands-free" at a called station. Intercom calls are originated in the standard manner, with the calling party lifting the handset at a station and selecting an idle intercom line. After the calling party depresses a direct station selection button that corresponds to the called station, a hands-free answer unit located in the called station automatically connects to the proper intercom line and provides an alerting tone to both the calling and called station. The calling party is then able to converse with the called party by alternately activating a loudspeaker and a microphone contained in the called station.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: June 12, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ralph L. Cerbone, Robert A. Lindsay, John M. Noonan, Martin G. Rudroff