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:
May. 08, 2018
Filed:
Jul. 11, 2013
Applicants:
Udo Weigand, München, DE;
Yven Rohlfing, München, DE;
Herbert Zinner, Rohrbach, DE;
Inventors:
Assignee:
RODENSTOCK GMBH, München, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08K 5/1545 (2006.01); C07D 493/06 (2006.01); C07D 311/94 (2006.01); G02B 1/04 (2006.01); G02C 7/10 (2006.01);
U.S. Cl.
CPC ...
C08K 5/1545 (2013.01); C07D 311/94 (2013.01); C07D 493/06 (2013.01); G02B 1/041 (2013.01); G02C 7/102 (2013.01);
Abstract
The present invention relates to photochromic fluorenopyrans with defined dibenzo[b,d]pyrano fusion in accordance with general formulae (I) or (II) and to their use in plastics of all kinds, particularly for ophthalmic purposes. The photochromic compounds of the invention are distinguished by two pronounced absorption bands of the open form in the visible wavelength range, meaning that with dye molecules of this kind it is possible to replace two conventional photochromic dyes each having only one discrete absorption band. The compounds of the invention, moreover, have a very good lifetime with very high performance.