Patents by Inventor Andrejs Pavuls

Andrejs Pavuls 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).

  • Cold header pierced valve stem
    Patent number: 5493887
    Abstract: A method of cold forming a plumbing and heating valve stem by providing a cylindrical blank workpiece, axially stamping the workpiece to circumferentially reduce and axially lengthen a portion of the workpiece, axially stamping the circumferentially larger portion to form a circumferentially enlarged head on the larger portion, while punching a central axial cylindrical cavity in the head to a depth no greater than the axial thickness of said head, and then axially punching the cylindrical axial cavity to a depth greater than the thickness of the head and also stamping a central cylindrical axial cavity into the opposite end, forming self tapping screw cavities. The larger portion is then provided with rolled threads.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: February 27, 1996
    Assignee: Nibco Inc.
    Inventors: William M. Good, Junior W. Rhodes, Andrejs Pavuls