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:
Nov. 18, 1997
Filed:
May. 15, 1996
Applicant:
Inventors:
Pietro Allegrini, Milan, IT;
Nereo Nodari, Milan, IT;
Vincenzo Malatesta, Milan, IT;
Luciana Crisci, Milan, IT;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C08K / ; C08K / ;
U.S. Cl.
CPC ...
524 99 ; 524109 ; 524110 ; 544 70 ; 544230 ; 549331 ;
Abstract
Polymeric compositions comprising a polymer and photochromic compounds belonging to the class of spiro-pyrans, having the general formula (I): ##STR1##