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:
Sep. 30, 2003
Filed:
Nov. 09, 2000
Applicant:
Inventor:
Vijay Kumar, Coralville, IA (US);
Assignee:
University of Iowa Research Foundation, Iowa City, IA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08B 1/500 ;
U.S. Cl.
CPC ...
C08B 1/500 ;
Abstract
A controlled chemical method to produce oxidized cellulose in high yields (75-95%) and different levels of oxidation (carboxyl content <25.6%, w/w), suitable for use as an immobilizing matrix or carrier for drugs, chemicals, and biological macromolecules, has been developed by reacting a cellulose material with a mixture of phosphoric acid and nitric acid and a small but adequate amounts of sodium nitrite at room temperature for a period until the desired oxidation level is obtained.