MANUFACTURE OF GRATING STRUCTURES - Patent 0635168

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EP 0 635 168 A1

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(43)	Date of publication:
	25.01.1995 Bulletin 1995/04

(21)	Application number: 93908017.0

(22)	Date of filing: 08.04.1993

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International Patent Classification (IPC):

G02B 5/ 18^{( . )}
H01L 21/ 308^{( . )}
H01S 5/ 12^{( . )}

G02B 6/ 124^{( . )}
H01S 5/ 00^{( . )}

(86)	International application number:
	PCT/GB1993/000750

(87)	International publication number:
	WO 1993/021671 (28.10.1993 Gazette 1993/26)

(84)	Designated Contracting States:
	DE FR GB NL

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Priority:

08.04.1992 GB 19920007627

(71)	Applicant: NORTHERN TELECOM LIMITED
	Montreal, Quebec H2Y 3Y4 (CA)

(72)	Inventors:
	PHILLIPS, Nicholas John Loughborough, Leics LE11 0JN (GB) YEO, Terence Edward Newton Abbott, Devon TQ12 3ED (GB)

(74)	Representative: Laurence, Simon French
	Nortel Limited Patents and Licensing West Road Harlow, Essex CM20 2SH Harlow, Essex CM20 2SH (GB)

(54)	MANUFACTURE OF GRATING STRUCTURES