(19)

(11)

EP 0 500 604 A1

(12)

(43) Date of publication: 02.09.1992 Bulletin 1992/36 (21) Application number: 90916108.0 (22) Date of filing: 01.11.1990

(51) International Patent Classification (IPC):  B29C 70/ 52( . ) B29C 70/ 20( . ) B29C 70/ 24( . ) C04B 35/ 80( . ) B29C 70/ 06( . ) B29C 70/ 22( . ) B29D 99/ 00( . ) (86) International application number: PCT/GB1990/001671 (87) International publication number: WO 1991/006421 (16.05.1991 Gazette 1991/11)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 01.11.1989 GB 19890024590 (71) Applicant: MAUNSELL STRUCTURAL PLASTICS LIMITED London SE20 7TP (GB)	(72) Inventor: HEAD, Peter, Richard Kent BR3 YEU (GB) (74) Representative: Dempster, Benjamin John Naftel  Withers & Rogers 4 Dyer's Buildings, Holborn London EC1N 2JT London EC1N 2JT (GB)