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:
May. 30, 1995
Filed:
Oct. 13, 1993
Yoshiaki Izumisawa, Kitakyushu, JP;
Tsukasa Kawahara, Mizumaki, JP;
Yoshiyuki Sumi, Kitakyushu, JP;
Takehiko Baba, Kitakyushu, JP;
Yoshio Ishinaga, Kitakyushu, JP;
Katsuhiko Fukui, Kitakyushu, JP;
Hironori Ohgi, Kitakyushu, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A process for producing highly pure terephthalic acid, which comprises heating and dissolving crude terephthalic acid in water, and purifying it by contacting the aqueous solution with hydrogen at a temperature of from 260.degree. to 320.degree. C. in the presence of a platinum group metal catalyst, wherein the purification is initiated within three minutes after the aqueous solution under heating reaches a temperature of 250.degree. C.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile