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:
Jun. 29, 1993
Filed:
Jun. 03, 1991
Applicant:
Inventor:
Kang Lin, Newark, DE (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549274 ;
Abstract
A process for preparing suture-grade .beta.-glycolide by purifying crude glycolide which comprises contacting the crude glycolide with a primary solvent which will dissolve the crude glycolide and residual impurities without dissolving primary impurities; removing the primary impurities; recovering the glycolide and residual impurities by evaporating the primary solvent at a temperature below 42.degree. C.; removing residual impurities by washing the glycolide with a washing solvent in which the residual impurities are soluble; and isolating the .beta.-glycolide crystals which remain.