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. 22, 2002
Filed:
Nov. 04, 1997
Applicant:
Inventors:
Guido Du Boulay Villax, Ilha Da Taipa, MO;
Alexandre Jose Ganchas De Carvalho, Vila Franca de Xira, PT;
Carlos Manuel Alvarez Perez, Lisbon, PT;
Assignee:
Hovione Inter Ltd., , CH;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
C07C / ;
Abstract
The object of the present invention is an industrial process for the purification and removal of residual solvents from iohexol, based on the suspension of crystalline iohexol, eventually containing residual solvents above 100 ppm, in a fluid wherein it has a low solubility, followed by heating, filtration and drying. The process allows the formation of crystalline iohexol with no residual organic residual solvent above 100 ppm and with an increased purity level.