(19)

(11)

EP 1 971 803 A2

(12)

(88) Date of publication A3: 10.01.2008 (43) Date of publication: 24.09.2008 Bulletin 2008/39 (21) Application number: 07717783.0 (22) Date of filing: 03.01.2007

(51) International Patent Classification (IPC):  F23C 5/00(2006.01) F23M 3/00(2006.01) (86) International application number: PCT/US2007/000041 (87) International publication number: WO 2007/081687 (19.07.2007 Gazette 2007/29)

(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 NL PL PT RO SE SI SK TR (30) Priority: 05.01.2006 US 325979 (71) Applicant: Petro-Chem Development Co., Inc. New York, NY 10017 (US)	(72) Inventors: GIBSON, Robert L. Tulsa, OK 74011 (US) GIBSON, William C. Tulsa, OK 74134 (US) (74) Representative: Freeman, Jacqueline Carol  W.P.Thompson & Co. 55 Drury Lane London WC2B 5SQ London WC2B 5SQ (GB)