(19)

(11)

EP 1 740 786 A1

(12)

(43) Date of publication: 10.01.2007 Bulletin 2007/02 (21) Application number: 05744899.5 (22) Date of filing: 28.04.2005

(51) International Patent Classification (IPC):  E04C 1/39(2006.01) E04H 17/14(2006.01) (86) International application number: PCT/US2005/014676 (87) International publication number: WO 2005/108702 (17.11.2005 Gazette 2005/46)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 29.04.2004 US 566590 P (71) Applicant: KEYSTONE RETAINING WALL SYSTEMS, INC. Bloomington, MN 55435 (US)	(72) Inventors: MACDONALD, Robert Plymouth, MN 55441 (US) DAWSON, William Medina, MN 55340 (US) (74) Representative: Howe, Steven  Lloyd Wise Commonwealth House, 1-19 New Oxford Street London WC1A 1LW London WC1A 1LW (GB)