Patents by Inventor Mathias J. Lieser

Mathias J. Lieser 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).

  • Method of forming valve bodies
    Patent number: 3991456
    Abstract: A method is disclosed of forming valve bodies of the spool valve type wherein sharp edges around the port openings in the interior chamber of the valve are eliminated. This is accomplished by blowing holes through the chamber wall to form the ports within the interior chamber. A tool is first used to bore partially through the valve body to leave a very thin annular portion which is readily parted when high pressure is applied to the interior chamber of the valve.
    Type: Grant
    Filed: May 6, 1974
    Date of Patent: November 16, 1976
    Assignee: Stanray Corporation
    Inventor: Mathias J. Lieser