Patents by Inventor Graham B. Roper

Graham B. Roper 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).

  • Electrical remote sensing system
    Patent number: 4198621
    Abstract: A sensing unit described in which the cable providing the unit with power also acts to transmit a signal representative of the parameter being sensed e.g. gas concentration. The unit comprises a switched mode voltage regulator the switching frequency of which corresponds to the value of the parameter being sensed.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: April 15, 1980
    Assignee: Crowcon (Instruments) Limited
    Inventor: Graham B. Roper