(19)

(11)

EP 2 486 156 A1

(12)

(43) Date of publication: 15.08.2012 Bulletin 2012/33 (21) Application number: 09850303.0 (22) Date of filing: 08.10.2009

(51) International Patent Classification (IPC):  C21C 5/42(2006.01) (86) International application number: PCT/US2009/005556 (87) International publication number: WO 2011/043759 (14.04.2011 Gazette 2011/15)

(84) Designated Contracting States: 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 (71) Applicant: Wagstaff, Inc. Spokane, WA 99216 (US)	(72) Inventors: COOPER, Timothy, James Rathdrum ID 83858 (US) IMTHURN, James, A. Hauser ID 83854 (US) (74) Representative: Hackett, Sean James  Marks & Clerk LLP Alpha Tower Suffolk Street Queensway Birmingham B1 1TT Queensway Birmingham B1 1TT (GB)