(19)

(11)

EP 0 242 357 A1

(12)

(43) Date of publication: 28.10.1987 Bulletin 1987/44 (21) Application number: 85906126.0 (22) Date of filing: 25.11.1985

(51) International Patent Classification (IPC):  F01M 11/ 03( . ) B01D 27/ 08( . ) (86) International application number: PCT/US1985/002312 (87) International publication number: WO 1987/001957 (09.04.1987 Gazette 1987/08)

(84) Designated Contracting States: BE CH DE FR GB IT LI SE (30) Priority: 30.09.1985 US 19850781623 (71) Applicant: CATERPILLAR INC. Peoria Illinois 61629-6490 (US)	(72) Inventors: GROEZINGER, John, J. Dunlap, IL 61525 (US) STREITMATTER, Ronald, W. Toulon, IL 61483 (US) (74) Representative: Jackson, Peter Arthur, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)