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. 16, 2007
Filed:
Feb. 02, 2004
Fumiaki Morishita, Tokyo, JP;
Atsushi Tojo, Yokohama, JP;
Takahiro Takinami, Yokohama, JP;
Yutaka Sugiyama, Yokohama, JP;
Fumiaki Morishita, Tokyo, JP;
Atsushi Tojo, Yokohama, JP;
Takahiro Takinami, Yokohama, JP;
Yutaka Sugiyama, Yokohama, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A process for producing a high purity trialkanolamine excelling in hue and having an APHA of not more than 40, characterizing by including producing a mixed alkanolamine by the reaction of an alkylene oxide with ammonia; removing low-boiling substances from the mixed alkanolamine; removing high-boiling substances by subjecting the product deprived of the low-boiling substance to vacuum distillation, and redistilling the distillate obtained by the vacuum distillation.