Patents by Inventor David E. Ford, Jr.

David E. Ford, Jr. 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).

  • Three terminal solid state pilot light
    Patent number: 4464605
    Abstract: In a pilot light usable for monitoring industrial control circuits a set of three terminals comprising a signal terminal, a test terminal and a line, or return terminal, with a signal circuit network between the signal and line terminals that supplies current to a lamp when a voltage is applied to the signal terminal, and with a test circuit network between the test and line terminals that supplies current to the lamp when a voltage is applied to the test terminal. Each circuit network includes a triac and a trigger branch subcircuit for controlling the associated triac.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: August 7, 1984
    Assignee: Allen-Bradley Company
    Inventors: David E. Ford, Jr., Daniel G. Kannenberg