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. 16, 1993
Filed:
Feb. 27, 1992
Applicant:
Inventors:
Graziano Castaldi, Briona, IT;
Pietro Allegrini, San Donato Milanese, IT;
Luciana Crisci, Sant'Angelo Lodigiano, IT;
Fiorenzo Renzi, Gorgonzola, IT;
Assignee:
Enichem Synthesis, S.p.A., Palermo, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02F / ; F21V / ; C07D / ;
U.S. Cl.
CPC ...
252586 ; 252583 ; 252589 ; 544 71 ;
Abstract
New compounds of the spiro-indoline-oxazine class possessing photochromatic and photosensitizing charecteristics are definable by the general formula (I): ##STR1## where the substituents R, R.sup.1 -R.sup.7 and A are as defined in the description. The process for preparing the compounds (I) is described, as is their use as photochromic agents able to confer photochromatic characteristics on the articles in which they are incorporated, and as photosensitizing agents.