(19)

(11)

EP 0 591 321 A1

(12)

(43) Date of publication: 13.04.1994 Bulletin 1994/15 (21) Application number: 92913106.0 (22) Date of filing: 18.06.1992

(51) International Patent Classification (IPC):  D21F 1/ 02( . ) (86) International application number: PCT/GB1992/001098 (87) International publication number: WO 1993/000471 (07.01.1993 Gazette 1993/02)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 26.06.1991 GB 19910013792 (71) Applicant: THE BLACK CLAWSON COMPANY Middletown, Ohio 45042 (US)	(72) Inventor: ATTWOOD, Brian William Staple Hill, Bristol BS16 5QS (GB) (74) Representative: Marles, Alan David  Stevens, Hewlett & Perkins 1 St. Augustine's Place Bristol BS1 4UD Bristol BS1 4UD (GB)