Patents by Inventor Margaret B. Hutchison

Margaret B. Hutchison 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).

  • Hand control valve
    Patent number: 5340079
    Abstract: A hand operated control valve for venting fluid pressure from a fluid line including a valve body having a vent port being controlled by a needle valve having an elongated shaft. The upper end of the elongated is affixed by a lift rod having a looped configuration to a pivotal lever. Upper and lower springs resiliently apply forces to the lever. Depression of the lever lifts the needle valve to progressively creates a variable flow opening for venting.
    Type: Grant
    Filed: November 1, 1993
    Date of Patent: August 23, 1994
    Inventors: John W. Hutchison, Margaret B. Hutchison