(19)

(11)

EP 0 274 513 A1

(12)

(43) Date of publication: 20.07.1988 Bulletin 1988/29 (21) Application number: 87904789.0 (22) Date of filing: 14.07.1987

(51) International Patent Classification (IPC):  H03K 3/ 53( . ) H02M 3/ 335( . ) F02P 3/ 08( . ) (86) International application number: PCT/US1987/001661 (87) International publication number: WO 1988/000768 (28.01.1988 Gazette 1988/03)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 15.07.1986 US 19860885912 (71) Applicant: COMBUSTION ELECTROMAGNETICS INC. Arlington Massachusetts 02174 (US)	(72) Inventor: WARD, Michael, A., V. 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)