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:
Jan. 20, 1976
Filed:
Dec. 19, 1973
Applicant:
Inventors:
Masaaki Ohkawa, Takatsuki, JA;
Koichi Ishii, Kobe, JA;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603092 ;
Abstract
A coumarin dye of the formula (Ia), ##SPC1## Wherein R.sub.1 is hydrogen, chlorine or C.sub.1 -C.sub.2 alkyl, R.sub.2 and R.sub.3 are hydrogen or C.sub.1 -C.sub.4 alkyl, or a quarternary salt thereof having the formula (Ib), ##SPC2## Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, R.sub.4 is C.sub.1 -C.sub.2 alkyl or benzyl, and X.sup.- is an anion, is prepared by an improved method, which comprises reacting a diamine of the formula, ##SPC3## Wherein R.sub.1 is as defined above, with a compound of the formula,