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. 02, 1982
Filed:
Feb. 06, 1980
Masaaki Hayami, Okayama, JP;
Seiko Torikoshi, Okayama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka Pref., JP;
Abstract
This invention relates to color-changing stryl-like compounds and the preparing of the same. A compound according to the present invention has, as its principal ring, an indoline ring of 2nd position, and has, at stimulation reversible or irreversible change(s) between a closed ring structre of a non-plane molecular structure indicated by the following chemical formula(1) showing white or pale color, and an open ring structure of a plane molecular structure indicated by the following chemical formula(2) showing vivid visible color: ##STR1## Wherein Q represents benzene ring with or without substituted radicals and/or condensed ring(s); R.sub.1 and R.sub.2 represent lower alkyl radicals hydroxyalkyl radicals or alkoxyalkyl radicals of the same or different kinds,; R.sub.3 represents hydrogen, alkyl radical, alkoxy radical, halogen, nitrile radical, aromatic radical or phenoxy radical; Y represents oxygen (O) or sulfer (S); Z represents alkylene radical of carbon number of 2 to 4 with or without alkyl substitution radical(s) necessary to form a ring structure together with ##STR2## A represents a condensation reaction residue of an aromatic aldehyde, heterocyclic aldehyde, aromatic nitroso compound, or heterocyclic nitroso compound. And X represents an anion.