Patents by Inventor Fred E. Brooks

Fred E. Brooks 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).

  • Patent number: 4171469
    Abstract: An abbreviated dialing system is connected in series with a telephone line connecting one or more subscriber telephone instruments to the telephone central office. This system incorporates either a low pass or other filter which prevents the transmission of Touch Tone signals from any subscriber telephone instrument to the telephone central office, but has negligible effect on the D.C. voltage, ring signal or dial tone signal sent out over the telephone line from the central office to the subscriber telephone equipment. A filter control circuit is controlled by logic circuitry to selectively either bypass the filter or insert it in series with the telephone line. When the subscriber lifts the handset of a telephone instrument, the filter is inserted in series with the telephone line. The subscriber then transmits an abbreviated series of Touch Tone signals which are intercepted and decoded by the system's logic circuitry.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: October 16, 1979
    Inventor: Fred E. Brooks