Patents by Inventor Charles L. Hopkins

Charles L. Hopkins 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).

  • Solenoid operated fluid valves
    Patent number: 3946287
    Abstract: By incorporating driver switching circuitry and a suppression network as parts fixed with respect to a valve housing rather than remotely from the valve housing, advantages including transient suppression at the housing are obtained rendering the valve better suited for low power machine control operation. Both AC and DC operated valves with driver switching circuits and suppression networks are disclosed.
    Type: Grant
    Filed: February 25, 1974
    Date of Patent: March 23, 1976
    Assignee: The Globe Tool and Engineering Company
    Inventor: Charles L. Hopkins