(19)

(11)

EP 2 443 287 A2

(12)

(88) Date of publication A3: 03.03.2011 (43) Date of publication: 25.04.2012 Bulletin 2012/17 (21) Application number: 10790175.3 (22) Date of filing: 17.06.2010

(51) International Patent Classification (IPC):  E01H 5/10(2006.01) E02D 3/11(2006.01) E01C 23/00(2006.01) (86) International application number: PCT/US2010/038957 (87) International publication number: WO 2010/148173 (23.12.2010 Gazette 2010/51)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 18.06.2009 US 218152 P (71) Applicant: Microwave Utilities, Inc. Monticello, MN 55362 (US)	(72) Inventor: HEGG, Vernon, R. Isanti MN 55040 (US) (74) Representative: Geyer, Fehners & Partner  Patentanwälte Perhamerstrasse 31 80687 München 80687 München (DE)