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:
Oct. 06, 2015
Filed:
Sep. 26, 2012
Applicants:
Udo Weigand, München, DE;
Herbert Zinner, Rohrbach, DE;
Yven Rohlfing, München, DE;
Inventors:
Assignee:
Rodenstock GmbH, München, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 1/04 (2006.01); C07D 493/04 (2006.01); C07D 493/14 (2006.01); C09K 9/02 (2006.01); C08K 5/156 (2006.01); G02B 5/23 (2006.01);
U.S. Cl.
CPC ...
G02B 1/041 (2013.01); C07D 493/04 (2013.01); C07D 493/14 (2013.01); C08K 5/156 (2013.01); C09K 9/02 (2013.01); C09K 2211/1088 (2013.01); G02B 5/23 (2013.01);
Abstract
The present invention relates to photochromic double-fused naphthopyrans of the general formula (I) or (II) and the use thereof in plastics of all kinds, particularly for ophthalmic purposes. The photochromic compounds according to the invention are characterized by two distinct absorption bands of the open form in the visible wavelength range, i.e. two conventional photochromic dyes, each having only one discrete absorption band, can be replaced with dye molecules of this type. The compounds according to the invention, moreover, have a very good lifetime with a very high performance.