(19)

(11)

EP 0 157 865 A1

(12)

(43) Date of publication: 16.10.1985 Bulletin 1985/42 (21) Application number: 84903777.0 (22) Date of filing: 25.09.1984

(51) International Patent Classification (IPC):  C03C 1/ 00( . ) C03C 13/ 00( . ) (86) International application number: PCT/US1984/001548 (87) International publication number: WO 1985/001498 (11.04.1985 Gazette 1985/09)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 28.09.1983 US 19830537254 (71) Applicant: ATLANTIC RICHFIELD COMPANY Los Angeles California 90071 (US)	(72) Inventor: HORIUCHI, Tetsuro Gardena, CA 90247 (US)