(19)

(11)

EP 0 428 669 A1

(12)

(43) Date of publication: 29.05.1991 Bulletin 1991/22 (21) Application number: 90908370.0 (22) Date of filing: 12.05.1990

(51) International Patent Classification (IPC):  F02P 15/ 00( . ) F02P 13/ 00( . ) F02B 75/ 02( . ) F02P 3/ 08( . ) H01F 38/ 12( . ) (86) International application number: PCT/US1990/002665 (87) International publication number: WO 1990/013742 (15.11.1990 Gazette 1990/26)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 12.05.1989 US 19890350945 27.11.1989 US 19890441523 (71) Applicant: COMBUSTION ELECTROMAGNETICS INC. Arlington Massachusetts 02174 (US)	(72) Inventors: WARD, Michael, A., V. Arlington, MA 02174 (US) REDL, Richard Arlington, MA 02174 (US) (74) Representative: Jones, Ian  W.P. THOMPSON & CO. Celcon House 289-293 High Holborn London WC1V 7HU London WC1V 7HU (GB)