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. 13, 1979
Filed:
Nov. 08, 1976
Akio Yamashita, Kawanishi, JP;
Masaaki Hayami, Okayama, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
This invention relates to an apparatus for changing color utilizing new materials, the color of which changes, disappears or appears at the stimulation by, for example, light, heat, ions, electricity, pressure or radioactive rays. The materials are new styryl-like compounds having the below mentioned chemical formula: ##STR1## Wherein Q represents a 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, an alkyl radical, alkoxy radical, halogen, nitrile radical, aromatic radical or phenoxy radical; Y represents oxygen (O) or sulphur (S); Z represents an alkylene radical of 2 to 4 carbon atoms 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.