Patents by Inventor Douglas W. Vallance

Douglas W. Vallance 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).

  • Valve construction
    Patent number: 5595218
    Abstract: A solid valve spool is split in two, by cutting through its center land diameter. A drill rod spacer is machined to length and inserted between the spool pieces to establish a spool assembly having a precise land width. The spool pieces and spacer are biased together in assembly so as to travel in unison, within a valve bushing, when shifted to control fluid flow, and the precisely-spaced land edges serve to pinch off fluid flow.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: January 21, 1997
    Assignee: Cincinnati Milacron Inc.
    Inventors: Raymond L. Hallbach, Miles E. Loretta, Jr., Douglas W. Vallance