Wall block
Latest Keystone Retaining Wall Systems, Inc. Patents:
Claims
The ornamental design for a wall block, as shown and described.
781413 | January 1905 | Fisher |
1344880 | June 1920 | Goe |
1419805 | June 1922 | Bigler |
4909717 | March 20, 1990 | Pardo |
5017049 | May 21, 1991 | Sievert |
D334815 | April 13, 1993 | Bunger |
D350402 | September 6, 1994 | Pribyl et al. |
D363787 | October 31, 1995 | Powell |
D417506 | December 7, 1999 | Harding |
D429004 | August 1, 2000 | Strand et al. |
D447045 | August 28, 2001 | Hundley |
6312197 | November 6, 2001 | Woolford et al. |
D458693 | June 11, 2002 | Sievert |
D530830 | October 24, 2006 | Collison et al. |
20040218985 | November 4, 2004 | Klettenberg et al. |
20050120670 | June 9, 2005 | Ness et al. |
20060110223 | May 25, 2006 | Dawson et al. |
20070193181 | August 23, 2007 | Klettenberg et al. |
WO 2009/052302 | April 2009 | WO |
- Jun. 15, 2009 International Search Report and Written Opinion for PCT Application Serial No. PCT/US2008/080188 (19 pages).
Type: Grant
Filed: Feb 11, 2010
Date of Patent: Mar 1, 2011
Assignee: Keystone Retaining Wall Systems, Inc. (Bloomington, MN)
Inventors: Robert A. MacDonald (Plymouth, MN), David M. LaCroix (St. Paul, MN)
Primary Examiner: T. Chase Nelson
Assistant Examiner: Anhdao Doan
Attorney: Popovich, Wiles & O'Connell, P.A.
Application Number: 29/355,661