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:
Apr. 27, 1993
Filed:
Jul. 22, 1991
Applicant:
Inventors:
Assignee:
Caffaro S.p.A., Vasto, IT;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564153 ; 564144 ;
Abstract
Process for purifying, by crystallization, TAED having a titer.gtoreq.99.5% from a mixture containing crude TAED obtained by acetylation of DAED, wherein the purification process is performed in two different stages (1, 2), characterized in that the temperatures at which the stages are performed differ from one another (delta t) by values comprised between 55.degree. and 110.degree..