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:
Oct. 11, 1977
Filed:
May. 02, 1975
Chang-Man Park, Naperville, IL (US);
Donald G Micklewright, Broadview Heights, OH (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
Terephthalic acid (TA) or isophthalic acid (IA) of fiber-grade quality is recovered under oxidation temperature and pressure conditions from fluid oxidation effluent from catalytic liquid phase oxidation of the respective xylene isomer in acetic acid with molecular oxygen by crystal size classification and acetic acid mother liquor displacement with hot, fresh acetic acid followed by quenching the new suspension of phthalic acid crystals in said hot solvent with colder fresh acetic acid solvent and separating the product crystals. Such technique eliminates the need for separately purifying crude TA or IA or converting TA or IA to the respective dimethyl ester and purifying the ester.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile