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:
Dec. 03, 2002
Filed:
Jun. 19, 2001
Applicant:
Inventors:
Stefano Carlino, Monthey, CH;
François Magnette, Marsens, CH;
Assignee:
Chemedica S.A., Vouvry, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07H 5/04 ; C07H 5/06 ; C08B 3/700 ;
U.S. Cl.
CPC ...
C07H 5/04 ; C07H 5/06 ; C08B 3/700 ;
Abstract
A process for purifying high molecular weight hyaluronic acid from a biological source, including the steps of adjusting the pH of an aqueous solution containing high molecular weight hyaluronic acid from a biological source to a pH in the range from 1.7 to 3.3 and then diafiltering said aqueous solution at the same pH using a filter having a pore size in the range from 100,000 Daltons nominal molecular cut-off to 0.45 m, and of removing cells from the aqueous solution containing high molecular weight hyaluronic acid from biological source.