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. 06, 1981
Filed:
Jun. 19, 1980
Susan B Gorman, Barrington, IL (US);
Ralph B Thompson, Oakbrook, IL (US);
Edward E Yonan, Carol Stream, IL (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
N-Benzyloxycarbonyl aspartic acid substantially free of N-benzyloxycarbonyl aspartyl aspartic acid is prepared by introducing benzyl chloroformate gradually into an aqueous solution of the disodium salt of aspartic acid at temperatures of between 10.degree. C. and about 45.degree. C. while maintaining the pH of the aqueous solution at between 10.75 and 11.75. In a further embodiment, the mole ratio of unreacted benzyl chloroformate to the aspartic acid salt in the reaction medium is maintained preferably at no greater than 0.2. The resulting reaction mixture is acidified, e.g, with hydrochloric acid, to convert the reaction product to the free acid, which is separated from the reaction mixture, washed with water and dried to yield an essentially pure white granular product.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile