(19)

(11)

EP 0 098 830 A1

(12)

(43) Date of publication: 25.01.1984 Bulletin 1984/04 (21) Application number: 82900723.0 (22) Date of filing: 18.01.1982

(51) International Patent Classification (IPC):  B01D 35/ 143( . ) H01H 35/ 28( . ) H01H 35/ 24( . ) (86) International application number: PCT/US1982/000055 (87) International publication number: WO 1983/002523 (21.07.1983 Gazette 1983/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: CATERPILLAR TRACTOR CO. Peoria, Illinois 61629 (US)

(72) Inventors: ANDREW, William K. East Peoria IL 61611 (US) BEHRENDS, Bertwin E. East Peoria IL 61611 (US) FUZZELL, Joe E. Peoria, IL 61604 (US) HANSEN, Brent A. Chillicothe IL 61523 (US) HEINRICH, Andrew L. Peoria, IL 61614 (US) PATTON, Douglas E. Peoria, IL 61614 (US) (74) Representative: Brunner, Michael John, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)