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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 4940636 B1

PDFFull Text
Date of Patent:
Jul. 10, 1990

Filed:

Jul. 21, 1988

Optical interference filter

Applicant:
Inventors:

Lieselotte Brock, Aachen, DE;

Gunter Frank, Aachen, DE;

Bruno Vitt, Aachen, DE;

Assignee:

U.S. Philips Corporation, New York, NY (US);

Attorney:

Fox; John C.

Primary Examiner:

Ellis P Robinson

Assistant Examiner:

Archene A Turner

Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428426 ; 350164 ; 428432 ; 428701 ;
Abstract

The optical interference filter is assembled from alternating amorphous SiO.sub.2 layers and layers made of mixed oxides chosen from

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