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:
May. 10, 1994
Filed:
Nov. 21, 1990
Applicant:
Inventors:
Evelyn Fischer, Weil am Rhein, DE;
Walter Fischer, Reinach, DE;
Jurgen Finter, Freiburg, DE;
Kurt Meier, Therwil, CH;
Martin Roth, Giffers, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
546 41 ; 546 49 ; 546 62 ; 546 70 ; 546103 ; 546192 ; 546207 ; 546208 ; 546209 ; 544 60 ; 544145 ; 544147 ; 544148 ; 544173 ; 544174 ; 544180 ; 5483644 ; 548418 ; 548423 ; 548517 ; 548518 ; 548525 ; 549 23 ; 549 24 ; 549 27 ; 549391 ; 549 25 ; 549234 ; 549235 ;
Abstract
Compounds of the formula I ##STR1## in which X is O, S, SO, SO.sub.2 or NR.sub.13, R.sub.13 is, for example, methyl, and R.sub.1 to R.sub.12, independently of one another, are, for example, H, C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 Alkoxy, halogen or --CN. The compounds are photosensitive and photochromic and are suitable as photosensitizers and simultaneously as color indicators, and as photoswitchable color filters.