(19)

(11)

EP 0 231 174 A1

(12)

(43) Date of publication: 12.08.1987 Bulletin 1987/33 (21) Application number: 85904046.0 (22) Date of filing: 08.08.1985

(51) International Patent Classification (IPC):  G02C 7/ 04( . ) (86) International application number: PCT/US1985/001494 (87) International publication number: WO 1987/000936 (12.02.1987 Gazette 1987/04)

(84) Designated Contracting States: DE FR GB IT (71) Applicant: VOLK, David Pepper Pike OH 44124 (US)	(72) Inventor: VOLK, David Pepper Pike OH 44124 (US) (74) Representative: Tregear, George Herbert Benjamin  LLOYD WISE, TREGEAR & CO Norman House 105-109 Strand London WC2R 0AE London WC2R 0AE (GB)