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.:
Date of Patent:
Dec. 02, 2008
Filed:
Dec. 13, 2001
Applicants:
Manfred Melzig, Wessling, DE;
Claudia Mann, Munich, DE;
Udo Weigand, Munich, DE;
Inventors:
Assignee:
Rodenstock GmbH, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 265/30 (2006.01); C07D 405/00 (2006.01); C07D 311/78 (2006.01); C07D 307/77 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to photochromic 2H-naphtho[1,2-b]pyrans as well as their use in synthetic resins of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic naphthopyran compounds, for which a further ring system is bonded to the f side of the naphthopyran. The inventive photochromic dyes generally have the general formula (I) wherein n, R, R, R, X, B and B' are defined as in claim. The inventive compounds are distinguished by good darkening and decolorizing properties and a very good service life.