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. 13, 2026
Filed:
Feb. 09, 2024
Shimadzu Corporation, Kyoto, JP;
Yusuke Masuda, Kyoto, JP;
Hidetoshi Terada, Kyoto, JP;
SHIMADZU CORPORATION, Kyoto, JP;
Abstract
A method for analyzing a sample containing a carboxylic acid anhydride includes, in a stated order, a first step of causing the sample to pass through a column together with a first mobile phase to detect a carboxylic acid anhydride eluted from the column in supercritical fluid chromatography, and a second step of causing a second mobile phase to pass through the column by switching the mobile phase from the first mobile phase to the second mobile phase after a lapse of a retention time of the carboxylic acid anhydride to detect at least one of a carboxylic acid ester and a carboxylic acid eluted from the column. The first mobile phase is a mixture of carbon dioxide and an organic solvent having no hydroxyl group, and the second mobile phase is a mixture of carbon dioxide, an acid, and an organic solvent having a hydroxyl group.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile