Patents by Inventor Raymond E. Johnson, deceased

Raymond E. Johnson, deceased 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).

  • Low current binary input subsystem
    Patent number: 5672919
    Abstract: Disclosed is a low current binary input subsystem for providing a binary input signal to a data acquisition system. The binary input subsystem monitors the open/close state of a field contact and provides galvanic isolation of noisy field contacts, high noise immunity, a steady state current of approximately 1.2 milliamps resulting in power dissipation of approximately 0.25 watts for a 125 VDC input, and a momentary high current pulse of approximately 150 milliamps for a duration of approximately 4 milliseconds during field contact closure to aid in cleaning of oxides from the field contact.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: September 30, 1997
    Assignee: ABB Power T&D Company Inc.
    Inventors: Raymond E. Johnson, deceased, B. S. Johns, administrator, Janusz W. Dzieduszko