Patents by Inventor W. Sherwood Campbell

W. Sherwood Campbell 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).

  • Cable television communication system with passive sensor signal path and a subscriber power supply source
    Patent number: 4724478
    Abstract: A cable television system includes security means. A security sensor is provided a subscriber's house and when it generates an emergency signal a transmission path is formed by non-active elements from the security sensor to a trunk cable. An external control unit has a checking function of a power supplying state to the security sensor. The external control unit can communicate with a central station with respect to power source conditions of subscribers.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: February 2, 1988
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akinori Masuko, Akio Ogawa, Yasuhiro Muramatsu, Hideki Hirosawa, Robert M. Rast, W. Sherwood Campbell
  • Communication data processing device of cable television system
    Patent number: 4686564
    Abstract: An external control unit for a CATV system has a CPU and a RAM with many kinds of memory maps. Reference data to be stored in the memory maps is transmitted from a central station. When a subscriber requests the tuning of a TV channel for a pay program to a converter tuner, the CPU in the external control unit can work, using the reference data.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: August 11, 1987
    Assignees: Kabushiki Kaisha Toshiba, American Television & Communications Corp.
    Inventors: Akinori Masuko, Wataru Kuroiwa, Shouji Uehara, Tsutomu Uekusa, Robert M. Rast, W. Sherwood Campbell