(19)

(11)

EP 0 602 091 A1

(12)

(43) Date of publication: 22.06.1994 Bulletin 1994/25 (21) Application number: 92918267.0 (22) Date of filing: 28.08.1992

(51) International Patent Classification (IPC):  F01N 1/ 00( . ) G10K 11/ 178( . ) F01N 1/ 06( . ) (86) International application number: PCT/GB1992/001594 (87) International publication number: WO 1993/005282 (18.03.1993 Gazette 1993/08)

(84) Designated Contracting States: DE ES FR GB IT SE (30) Priority: 29.08.1991 GB 19910018779 (71) Applicant: ACTIVE NOISE AND VIBRATION TECHNOLOGIES INC. Phoenix, AZ 85040 (US)	(72) Inventors: JONES, Owen Chattisham, Ipswich IP8 3PX (GB) TRINDER, Michael Charles John, Rymer Colchester, Essex CO7 6QX (GB) (74) Representative: Read, Matthew Charles, et al  Venner Shipley & Co. 20 Little Britain London EC1A 7DH London EC1A 7DH (GB)