(19)

(11)

EP 0 869 870 A1

(12)

(43) Date of publication: 14.10.1998 Bulletin 1998/42 (21) Application number: 97926865.0 (22) Date of filing: 03.06.1997

(51) International Patent Classification (IPC):  G02B 26/ 10( . ) (86) International application number: PCT/US1997/009441 (87) International publication number: WO 1997/046391 (11.12.1997 Gazette 1998/01)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 03.06.1996 US 19960657176 (71) Applicant: Chiang, Tom Jaungtain Berwyn, PA 19312 (US)	(72) Inventor: Chiang, Tom Jaungtain Berwyn, PA 19312 (US) (74) Representative: Patentanwälte Westphal, Buchner, Mussgnug Neunert, Göhring  Waldstrasse 33 78048 Villingen-Schwenningen 78048 Villingen-Schwenningen (DE)