Patents by Inventor Melvin Winquist

Melvin Winquist 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).

  • Four way valve
    Patent number: 6401754
    Abstract: A four way valve which is relatively easy to manufacture and which is smaller than conventional four way valves for a given bore size or flow capacity. The valve can be formed utilizing a closure having a pair of intersecting bores, with a separator provided within the closure to form two isolated passageways or flow paths. An improved sealing/seating arrangement is also provided.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: June 11, 2002
    Assignee: Metso Automation USA Inc.
    Inventors: Melvin Winquist, David Bayreuther