(19)

(11)

EP 0 870 156 A1

(12)

(43) Date of publication: 14.10.1998 Bulletin 1998/42 (21) Application number: 96943510.0 (22) Date of filing: 21.11.1996

(51) International Patent Classification (IPC):  F23N 1/ 00( . ) F24C 3/ 12( . ) (86) International application number: PCT/US1996/018778 (87) International publication number: WO 1997/019296 (29.05.1997 Gazette 1997/23)

(84) Designated Contracting States: DE ES FR GB IT (30) Priority: 21.11.1995 US 19950561579 22.11.1995 US 19950562018 (71) Applicant: ROBERTSHAW CONTROLS COMPANY Richmond, VA 23261-6544 (US)	(72) Inventors: MARTIN, David, D. Dunbar, PA 15431 (US) RAY, Douglas, W. Irwin, PA 15642 (US) (74) Representative: Greenwood, John David, et al  Graham Watt & Co. Riverhead Sevenoaks Kent TN13 2BN Sevenoaks Kent TN13 2BN (GB)