(19)

(11)

EP 0 504 174 A1

(12)

(43) Date of publication: 23.09.1992 Bulletin 1992/39 (21) Application number: 90917470.0 (22) Date of filing: 04.12.1990

(51) International Patent Classification (IPC):  D04B 21/ 02( . ) (86) International application number: PCT/GB1990/001885 (87) International publication number: WO 1991/008331 (13.06.1991 Gazette 1991/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 05.12.1989 GB 19890027479 (71) Applicant: BRIGHTWAKE LIMITED Kirkby-In-Ashfield Nottingham NG17 7JZ (GB)	(72) Inventor: ALLEN, Kenneth, Alfred 44a Wood Lane Nottingham MG15 6LR (GB) (74) Representative: Dealtry, Brian, et al  Eric Potter & Clarkson St. Mary's Court St. Mary's Gate Nottingham NG1 1LE Nottingham NG1 1LE (GB)