(19)

(11)

EP 0 403 473 A1

(12)

(43) Date of publication: 27.12.1990 Bulletin 1990/52 (21) Application number: 88903035.0 (22) Date of filing: 03.03.1988

(51) International Patent Classification (IPC):  C01G 23/ 053( . ) (86) International application number: PCT/US1988/000649 (87) International publication number: WO 1989/008078 (08.09.1989 Gazette 1989/21)

(84) Designated Contracting States: CH DE FR GB IT LI NL SE (71) Applicant: ALLIED-SIGNAL, INC. Morristown, NJ 07960 (US)	(72) Inventors: OLSON, William, L. Goleta, CA 93117 (US) LISS, William, E. Lombard, IL 60148 (US) (74) Representative: Brock, Peter William  Urquhart-Dykes & Lord 1 Richfield Place Richfield Avenue Reading RG1 8EQ Berkshire Reading RG1 8EQ Berkshire (GB)