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:
Apr. 19, 1983
Filed:
Apr. 20, 1981
Akio Yamashita, Machida, JP;
Masaaki Hayami, Okayama, JP;
Matsushita Electric Industrial Company, Limited, Osaka, JP;
Abstract
Styryl-like compounds showing improved stability and prolonged lifetime on repetition of the coloration and bleaching cycle and represented by the general formula ##STR1## in which R represents an alkyl or phenyl group, R.sub.1 and R.sub.2 independently represent a lower alkyl group, a hydroxyalkyl group, or an alkoxyalkyl group, R.sub.3 represents hydrogen, an alkyl group, a halogen, a nitrile group, an aromatic group or a phenoxy group, Y represents O or S, Z represents an alkylene radical of 2 to 4 carbon atoms, with or without alkyl substituent(s), necessary for forming a ring structure together with ##STR2## A represents a residue of an aromatic aldehyde, a heterocyclic aldehyde, an aromatic nitroso compound or a heterocyclic nitroso compound, and n is an integer of 2 or 3.