(19)

(11)

EP 0 694 174 A1

(12)

(43) Date of publication: 31.01.1996 Bulletin 1996/05 (21) Application number: 94927434.0 (22) Date of filing: 05.04.1994

(51) International Patent Classification (IPC):  G02B 6/ 28( . ) (86) International application number: PCT/US1994/003709 (87) International publication number: WO 1994/023319 (13.10.1994 Gazette 1994/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 06.04.1993 US 19930043358 17.12.1993 US 19930169512 (71) Applicant: PORTA SYSTEMS CORPORATION Syosset, NY 11791 (US)	(72) Inventors: STOWE, David, W. Milford, MA 01757 (US) CRYAN, Colm, V. Arlington, MA 02174 (US) MAACK, Dave, R. Mendon, MA 01756 (US) (74) Representative: LOUIS, PÖHLAU, LOHRENTZ & SEGETH  Postfach 3055 D-90014 Nürnberg D-90014 Nürnberg (DE)