(19)

(11)

EP 0 610 399 A1

(12)

(43) Date of publication: 17.08.1994 Bulletin 1994/33 (21) Application number: 92923468.0 (22) Date of filing: 24.10.1992

(51) International Patent Classification (IPC):  E04C 3/ 28( . ) C04B 35/ 00( . ) G02B 7/ 182( . ) B28B 1/ 26( . ) C04B 35/ 515( . ) G02B 7/ 183( . ) (86) International application number: PCT/US1992/009235 (87) International publication number: WO 1993/009068 (13.05.1993 Gazette 1993/12)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 29.10.1991 US 19910784297 (71) Applicant: UNITED TECHNOLOGIES CORPORATION Hartford, CT 06101 (US)	(72) Inventor: ARNOLD, Joe, F. Palm Beach Gardens, FL 33410 (US) (74) Representative: Schmitz, Jean-Marie, et al  Dennemeyer & Associates Sàrl P.O. Box 1502 L-1015 Luxembourg L-1015 Luxembourg (LU)