(19)

(11)

EP 0 502 002 A1

(12)

(43) Date of publication: 09.09.1992 Bulletin 1992/37 (21) Application number: 90916779.0 (22) Date of filing: 21.11.1990

(51) International Patent Classification (IPC):  F24D 3/ 08( . ) F24H 1/ 18( . ) (86) International application number: PCT/GB1990/001790 (87) International publication number: WO 1991/008422 (13.06.1991 Gazette 1991/13)

(84) Designated Contracting States: AT BE DE DK ES FR GB IT NL SE (30) Priority: 25.11.1989 GB 19890026686 (71) Applicant: Ventank Products Ltd. Blackburn BB1 5BL (GB)	(72) Inventor: CARRUTHERS, Thomas, Robison Glasgow G44 3QY (GB) (74) Representative: MacDougall, Donald Carmichael, et al  Cruikshank & Fairweather 19 Royal Exchange Square Glasgow G1 3AE, Scotland Glasgow G1 3AE, Scotland (GB)