US Patent 6,627,749
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A controlled chemical method to produce oxidized cellulose in high yields (75-95%) and different levels of oxidation (carboxyl content
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Kumar, Vijay Powdered oxidized cellulose. US Patent 6,627,749 filed November 09, 2000 and issued September 30, 2003. https://ir.uiowa.edu/patents/338