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:
Sep. 30, 2003
Filed:
Jun. 10, 2002
Applicant:
Inventors:
Valeri Krongauz, Rehovot, IL;
Emmanuel Lurie, Lod, IL;
Alexandre Chif, Rostov-on-Don, RU;
Judith Ratner, Rehovot, IL;
Assignee:
Yeda Research and Development Co. Ltd., Rehovot, IL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/23 ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
G02B 5/23 ; C07D / ; C07D / ;
Abstract
A photochromic naphthopyran of formula (I) wherein R through R , which may be the same or different, are independently selected from the group consisting of hydrogen, C -C alkyl, C -C alkoxy, halogen, C -C alkylcarbonyloxy, benzoyloxy, C -C cycloalkyl, phenyl, and NR R , wherein R and R are each C -C alkyl or together with the N atom form a 5-12 membered monocyclic or polycyclic ring having, optionally, one or more further heteroatoms; R is hydrogen, alkyl or alkoxy; and >C(C H ) (C H ) is a tert-alkylene grup, wherein n and m are integers from 1 to 5.