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:
Feb. 20, 2001
Filed:
Nov. 23, 1999
Applicant:
Inventors:
Manfred Melzig, Wessling, DE;
Herbert Zinner, Taufkirchen, DE;
Assignee:
Optische Werke G. Rodenstock, Munich, DE;
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/23 ; C08J 5/49 ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
G02B 5/23 ; C08J 5/49 ; C07D / ; C07D / ; C07D / ;
Abstract
Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their special structure, have a reduced tendency of the molecules to migrate in plastics.