(19)

(11)

EP 0 071 605 A1

(12)

(43) Date of publication: 16.02.1983 Bulletin 1983/07 (21) Application number: 81902946.0 (22) Date of filing: 21.10.1981

(51) International Patent Classification (IPC):  C03C 14/ 00( . ) C03C 27/ 06( . ) C03C 17/ 06( . ) G02B 5/ 08( . ) (86) International application number: PCT/SE1981/000312 (87) International publication number: WO 1982/001421 (29.04.1982 Gazette 1982/11)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 22.10.1980 SE 19800007420 (71) Applicant: RENNERFELT, Gustav Bernhard S-181 47 Lidingö (SE)	(72) Inventor: RENNERFELT, Gustav Bernhard S-181 47 Lidingö (SE) (74) Representative: Svanfeldt, Hans-Ake, et al  Erik Lindquist Patentbyra AB P.O. Box 5386 S-102 46 Stockholm S-102 46 Stockholm (SE)