Patents by Inventor Donald Charles Long

Donald Charles Long 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).

  • Controllable electrical switch
    Patent number: 3938010
    Abstract: An electrical switch which can be remotely conditioned to an "ON" or "OFF" state, but which can also be controlled at the switch location, if desired. The conditioning of the switch is controlled by a means of a bistable electromechanical relay, a pair of silicon controlled rectifiers, a pair of transistors, and a pair of capacitance discharge circuits.
    Type: Grant
    Filed: March 5, 1975
    Date of Patent: February 10, 1976
    Assignee: Princeton Electro Dynamics, Inc.
    Inventors: Donald Charles Long, Albert Charles Hartsough, Robert Fincher Sanford