Patents by Inventor Michael A. Berkelhammer

Michael A. Berkelhammer 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
    Patent number: D489797
    Type: Grant
    Filed: February 11, 2003
    Date of Patent: May 11, 2004
    Assignee: United Brass Works, Inc.
    Inventors: Thomas Hall, Michael A. Berkelhammer
  • Sight glass for sprinkler system lines
    Patent number: D412454
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: August 3, 1999
    Assignee: United Brass Works, Inc.
    Inventor: Michael A. Berkelhammer