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:
Jan. 19, 1993
Filed:
Dec. 20, 1990
Applicant:
Inventors:
Franklin Boardman, Englishtown, NJ (US);
Lowell Saferstein, Edison, NJ (US);
Assignee:
Johnson & Johnson Medical, Inc., Arlington, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D06M / ;
U.S. Cl.
CPC ...
8181 ; 81161 ;
Abstract
A process for oxidizing cellulose involves reacting the cellulose with a solution of nitrogen dioxide in a perfluorocarbon solvent. In preferred embodiments, the solvent has a boiling point in the range between about 30.degree. C. and 100.degree. C., the nitrogen dioxide concentration in the solution is in the range between about 2% and 12% by weight, and the reactants are maintained at a temperature between about 25.degree. C. and 60.degree. C. during a reaction time fo at least about 7 hours.