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. 10, 2002
Filed:
Oct. 10, 2001
Applicant:
Inventors:
James E. Sealey, II, Federal Way, WA (US);
W. Harvey Persinger, Jr., Enumclaw, WA (US);
Mengkui Luo, Tacoma, WA (US);
Vincent A. Roscelli, Edgewood, WA (US);
Amar N. Neogi, Seattle, WA (US);
Assignee:
Weyerhaeuser Company, Federal Way, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9/147 ; D21C 9/157 ; D21C 9/16 ;
U.S. Cl.
CPC ...
D21C 9/147 ; D21C 9/157 ; D21C 9/16 ;
Abstract
The present invention is directed to a process for making a lyocell fiber by contacting an alkaline pulp having cellulose and at least about 7% hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to the range of from about 200 to about 1100 without substantially reducing the hemicellulose content of the pulp or increasing the copper number and then forming fibers from the pulp.