Patents by Inventor Steven E. Marshall

Steven E. Marshall 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).

  • Motor operated restrictor valve
    Patent number: 5588617
    Abstract: A motor operated restrictor valve including a valve assembly for preventing noise at lavatories and galleys of an aircraft while permitting waste water to pass overboard through the drain mast.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: December 31, 1996
    Assignee: The Boeing Company
    Inventors: Daniel L. Bliss, Steven E. Marshall, Michael I. Ruby