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:
Sep. 14, 1976
Filed:
May. 17, 1973
Applicant:
Inventors:
Daisaku Matsunaga, Yono, JA;
Mitsukuni Sumitani, Chuo Soka, JA;
Assignee:
Nippon Kayaku Co., Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2606 / ; 8 1 / ; 2605 / ; 2605 / ; 2605 / ; 2606 / ; 2606 / ;
Abstract
This invention relates to compounds which are valuable as a fluorescent brightener and a novel process for producing the same. The present invention is based on the following discoveries made by the inventors: In the presence of a palladium catalyst and a base at an elevated temperature, 1 mole of a compound of the formula,