Patents by Inventor J. Michael Stevenson

J. Michael Stevenson 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).

  • Plantable wall block
    Patent number: D384168
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: September 23, 1997
    Assignee: Keystone Retaining Wall & Systems, Inc.
    Inventor: J. Michael Stevenson
  • Section of a retaining wall with plantable blocks
    Patent number: D397451
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: August 25, 1998
    Assignee: Keystone Retaining Wall Systems, Inc.
    Inventor: J. Michael Stevenson