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:
Mar. 15, 2022
Filed:
Feb. 25, 2021
Applicant:
Hodogaya Chemical Co., Ltd., Tokyo, JP;
Inventors:
Keigo Naito, Tokyo, JP;
Tetsuya Yoshida, Tokyo, JP;
Assignee:
HODOGAYA CHEMICAL CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61Q 5/10 (2006.01); A61K 8/41 (2006.01); A61K 8/49 (2006.01);
U.S. Cl.
CPC ...
A61K 8/416 (2013.01); A61K 8/49 (2013.01); A61Q 5/10 (2013.01); A61K 2800/4324 (2013.01); A61K 2800/48 (2013.01); A61K 2800/805 (2013.01);
Abstract
A dye for hair coloration that has a long shelf life and is excellent in heat resistance, and a method for producing the dye for hair coloration, are provided. A dye for hair coloration represented by the following general formula (1), the dye for hair coloration having a proportion of a polyatomic anion (An) or impurities derived from An of 1% by mass or less: wherein in the formula (1), D represents a cationic moiety of the dye for hair coloration; An represents a polyatomic anion; and a and b each independently represent a value of 0 to 1.