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:
Jul. 02, 1996
Filed:
May. 12, 1994
Applicant:
Inventors:
Pietro Allegrini, San Donato Milanese, IT;
Nereo Nodari, Mairago, IT;
Vincenzo Malatesta, S. Maurizio Al Lambro, IT;
Luciana Crisci, Graffignana, IT;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
544 70 ; 544230 ; 546 15 ; 546 18 ; 549331 ;
Abstract
Photochromic compounds belonging to the class of spiro-pyrans, having the general formula (I): ##STR1##