Patents by Inventor James Franklin Hoyle

James Franklin Hoyle 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).

  • Test circuit for a protective coupler
    Patent number: 4101743
    Abstract: The test circuit disconnects the active elements of the coupler from the input and output and applies a test signal to the input of the active elements. The output of the active elements is first compared with a first threshold which if exceeded or equaled provides a first indication. Within a predetermined time period the output of the active elements is compared with a second threshold to determine if the control function of the active element has reduced the input to the second threshold within the time period. If this condition prevails, the indication previously provided is removed; otherwise, the indication remains and a faulty coupler is indicated.
    Type: Grant
    Filed: June 6, 1977
    Date of Patent: July 18, 1978
    Assignee: International Business Machines Corporation
    Inventors: Michel Leon Costes, James Franklin Hoyle