Patents by Inventor Philip D. Zimmerman

Philip D. Zimmerman 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).

  • Battery tester
    Patent number: D515444
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: February 21, 2006
    Assignee: ZTS, Inc.
    Inventors: David E. Zimmerman, Philip D. Zimmerman
  • Battery tester
    Patent number: D569285
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: May 20, 2008
    Assignee: ZTS, Inc.
    Inventors: David E. Zimmerman, Philip D. Zimmerman
  • Battery tester
    Patent number: D611851
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: March 16, 2010
    Assignee: ZTS, Inc.
    Inventors: David E. Zimmerman, Philip D. Zimmerman