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:
Jun. 16, 1981
Filed:
Sep. 07, 1979
Applicant:
Inventors:
Yasushi Yamada, Omiya, JP;
Hiroshi Ozawa, Koshigaya, JP;
Masae Gomi, Toda, JP;
Hideshiro Nomura, Urawa, JP;
Assignee:
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
8673 ; 260168 ;
Abstract
An azo compound which in the free acid form is represented by the following formula: ##STR1## where R.sub.1 stands for methyl, ethyl, R.sub.2 stands for hydrogen, methyl, methoxy or ethoxy, R.sub.3 stands for hydrogen or methyl, and K stands for ##STR2## wherein the benzene nucleus A may be further substituted by methyl, amino, acetylamino or methoxy or: ##STR3## wherein these naphthalene neuclei may be further substituted by hydroxy, amino or acetylamino, also a process for preparing the azo compound and a dyeing method using said azo compound.