Patents Assigned to Keystone Retaining Wall Systems
  • Retaining wall block
    Patent number: RE37278
    Abstract: A retaining wall is made from a plurality of blocks arranged in rows superimposed on each other and pinned together. Each block has a body with an exterior face and rearwardly diverging side walls joined to a neck. A head having outwardly directed ears is joined to the neck. The body has holes and pockets for pins that interlock overlapped blocks together.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: July 17, 2001
    Assignee: Keystone Retaining Wall Systems
    Inventor: Paul J. Forsberg
  • Landscape edger
    Patent number: D657890
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: April 17, 2012
    Assignee: Keystone Retaining Wall Systems
    Inventor: Thomas S. Riccobene
  • Retaining wall block
    Patent number: D430308
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: August 29, 2000
    Assignee: Keystone Retaining Wall Systems
    Inventor: William B. Dawson