(19)

(11)

EP 1 135 564 A1

(12)

(43) Date of publication: 26.09.2001 Bulletin 2001/39 (21) Application number: 99956172.3 (22) Date of filing: 19.11.1999

(51) International Patent Classification (IPC)7: E04C 2/22 (86) International application number: PCT/GB9903/880 (87) International publication number: WO 0031/356 (02.06.2000 Gazette 2000/22)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 26.11.1998 GB 9825958 (71) Applicant: Mitie Plastics Limited Maidenhead,Berks SL6 1BU (GB)	(72) Inventor: SMITH, James, Leonard Woburn Hill ParkWeybridge KT16 2NZ (GB) (74) Representative: Silverman, Warren et al Haseltine Lake & Co.Imperial House,15-19 Kingsway London WC2B 6UD London WC2B 6UD (GB)