Patents by Inventor Thomas S. Hammer

Thomas S. Hammer 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).

  • Retaining wall block
    Patent number: D435917
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: January 2, 2001
    Inventor: Thomas S. Hammer
  • Retaining wall block
    Patent number: D466228
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: November 26, 2002
    Assignee: Westblock Systems, Inc.
    Inventor: Thomas S. Hammer
  • Retaining wall block
    Patent number: D468450
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: January 7, 2003
    Assignee: Westblock Systems, Inc.
    Inventor: Thomas S. Hammer
  • Retaining wall block
    Patent number: D475143
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: May 27, 2003
    Assignee: Westblock Systems, Inc.
    Inventor: Thomas S. Hammer
  • Retaining wall block
    Patent number: D433158
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: October 31, 2000
    Assignee: Westblock Systems, Inc.
    Inventor: Thomas S. Hammer