(19)

(11)

EP 0 152 444 A1

(12)

(43) Date of publication: 28.08.1985 Bulletin 1985/35 (21) Application number: 84903072.0 (22) Date of filing: 10.08.1984

(51) International Patent Classification (IPC):  C03B 5/ 02( . ) C03B 5/ 04( . ) C03B 5/ 235( . ) C03B 5/ 027( . ) C03B 5/ 12( . ) (86) International application number: PCT/GB1984/000278 (87) International publication number: WO 1985/000801 (28.02.1985 Gazette 1985/05)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 10.08.1983 GB 19830021525 (71) Applicant: ROCKWARE GROUP PLC Northampton, NN1 5DW (GB)	(72) Inventor: CRAIGIE, John, Henry London, S.W.5 (GB)