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:
Mar. 01, 2005
Filed:
Apr. 23, 2002
James E. Sealey, Ii, Federal Way, WA (US);
W. Harvey Persinger, Jr., Enumclaw, WA (US);
Mengkui Luo, Tacoma, WA (US);
Brian Wester, Sumner, WA (US);
James E. Sealey, II, Federal Way, WA (US);
W. Harvey Persinger, Jr., Enumclaw, WA (US);
Mengkui Luo, Tacoma, WA (US);
Brian Wester, Sumner, WA (US);
Weyerhaeuser Company, Federal Way, WA (US);
Abstract
A process for making lyocell fibers including the steps of pulping raw material in a digester to provide an alkaline pulp, wherein the raw material includes sawdust in an amount greater than 0% up to 100%; contacting the alkaline pulp including 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 or substantially increasing the copper number of the pulp; and forming fibers from the pulp.