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(11)

EP 2 038 580 A2

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(88) Date of publication A3: 24.04.2008 (43) Date of publication: 25.03.2009 Bulletin 2009/13 (21) Application number: 07796334.6 (22) Date of filing: 21.06.2007

(51) International Patent Classification (IPC):  F23B 70/00(2006.01) F23G 7/00(2006.01) F23C 9/06(2006.01) F23L 7/00(2006.01) (86) International application number: PCT/US2007/014493 (87) International publication number: WO 2008/002452 (03.01.2008 Gazette 2008/01)

(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 LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 27.06.2006 US 475027 (71) Applicant: PRAXAIR TECHNOLOGY, INC. Danbury, CT 06810-5113 (US)	(72) Inventors: BOOL, Lawrence E., III East Aurora, NY 14052 (US) JOHNSON, Stephen A. Windham, NH 03087 (US) SHAH, Minish Mahendra East Amherst, NY 14051 (US) (74) Representative: Schwan - Schwan - Schorer  Patentanwälte Bauerstrasse 22 80796 München 80796 München (DE)