Patents by Inventor Stuart F. Webb

Stuart F. Webb 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).

  • Lamp monitoring circuit
    Patent number: 4572987
    Abstract: In order to provide a lamp failure warning in both illuminated and unilluminated states of the lamp, there is provided a resistance bridge circuit Rs, L, R2 and R3 which is substantially in balance if the lamp L is sound. An amplifier IC1 acts as a detection means if the bridge goes out of balance as a consequence of failure of the lamp L. In the unilluminated state a reduced current is fed to the bridge via a high value resistance R1, which is by-passed by a lamp switch SW1 if the lamp is to receive enough power to illuminate it.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: February 25, 1986
    Assignee: AB Electronic Components Limited
    Inventors: Derek M. Embrey, Stuart F. Webb, Graham J. Legg
  • Gearbox indicator switch
    Patent number: 4554422
    Abstract: In order to provide a reliable position indicator for a gear control, particularly for automatic transmission motor vehicles, use is made of reed switches (2). These may be mounted in a sealed housing and operable by a magnet (1) from outside the housing. The magnet (1) is movable by and with the gear control. The reed switches (2) may be mounted on a printed circuit board (3) and flux concentrators (4) are preferably provided between adjacent reed switches (2) to shield them until the magnet (1) is closely adjacent.
    Type: Grant
    Filed: September 27, 1983
    Date of Patent: November 19, 1985
    Assignee: AB Electronic Components Limited
    Inventors: Derek M. Embrey, Stuart F. Webb, Ian J. Bickford, Argus F. Caxton Doss-Desouza