(19)

(11)

EP 0 904 511 A1

(12)

(43) Date of publication: 31.03.1999 Bulletin 1999/13 (21) Application number: 97921558.0 (22) Date of filing: 23.05.1997

(51) International Patent Classification (IPC):  F23D 11/ 00( . ) F23D 11/ 40( . ) F23N 5/ 08( . ) F23D 11/ 10( . ) F23K 5/ 04( . ) (86) International application number: PCT/CA1997/000340 (87) International publication number: WO 1997/045676 (04.12.1997 Gazette 1997/52)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 24.05.1996 US 19960654967 05.05.1997 US 19970851465 (71) Applicant: International Thermal Investments Ltd. Richmond, British Columbia v6V 1Y3 (CA)	(72) Inventors: ROBINSON, Edgar, C. Vancouver, British Columbia V5R 1A7 (CA) FLEMING, Leonard Richmond, British Columbia V6V 1Y3 (CA) (74) Representative: Gilding, Martin John  Eric Potter Clarkson, Park View House, 58 The Ropewalk Nottingham NG1 5DD Nottingham NG1 5DD (GB)