(19)

(11)

EP 0 534 979 A1

(12)

(43) Date of publication: 07.04.1993 Bulletin 1993/14 (21) Application number: 91907889.0 (22) Date of filing: 16.04.1991

(51) International Patent Classification (IPC):  C03C 25/ 26( . ) (86) International application number: PCT/US1991/002500 (87) International publication number: WO 1992/018432 (29.10.1992 Gazette 1992/27)

(84) Designated Contracting States: BE DE FR GB IT (71) Applicant: OWENS-CORNING FIBERGLAS CORPORATION Toledo, Ohio 43659 (US)	(72) Inventors: POLLET, Jean-Claude F-78740 Vaux-sur-Seine (FR) WILLIAMS, Gary, Lynn Newark, OH 43055 (US) ARMSTRONG, Gordon, Patrick Sugarloaf, PA 18249 (US) FLAUTT, Martin, Charles Granville, OH 43023 (US) (74) Representative: West, Alan Harry, et al  R.G.C. Jenkins & Co. 26 Caxton Street London SW1H 0RJ London SW1H 0RJ (GB)