(19)

(11)

EP 0 500 922 A1

(12)

(43) Date of publication: 02.09.1992 Bulletin 1992/36 (21) Application number: 91918630.0 (22) Date of filing: 03.09.1991

(51) International Patent Classification (IPC):  A61F 2/ 16( . ) G02B 3/ 14( . ) (86) International application number: PCT/US1991/006414 (87) International publication number: WO 1992/003989 (19.03.1992 Gazette 1992/07)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 04.09.1990 US 19900577473 11.03.1991 US 19910667671 14.03.1991 US 19910669499 (71) Applicants: WILEY, Robert G. Toledo, OH 43615 (US) MARTIN, William G. Toledo, OH 43606 (US)	(72) Inventors: WILEY, Robert G. Toledo, OH 43615 (US) MARTIN, William G. Toledo, OH 43606 (US) (74) Representative: Hands, Horace Geoffrey, et al  LEWIS W. GOOLD & CO. Whitehall Chambers 23, Colmore Row Birmingham B3 2BL Birmingham B3 2BL (GB)