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. 01, 2009
Filed:
May. 16, 2006
Brock Lundberg, Roberts, WI (US);
Lin Gu, Seattle, WA (US);
Rongsheng Roger Ruan, Arden Hills, MN (US);
Ling Chen, Roseville, MN (US);
Paul Bradley Addis, St. Paul, MN (US);
Jack Edgar Johnson, Waseca, MN (US);
Brock Lundberg, Roberts, WI (US);
Lin Gu, Seattle, WA (US);
Rongsheng Roger Ruan, Arden Hills, MN (US);
Ling Chen, Roseville, MN (US);
Paul Bradley Addis, St. Paul, MN (US);
Jack Edgar Johnson, Waseca, MN (US);
Regents of the University of Minnesota, St. Paul, MN (US);
Agricultural Utilization Research Institute, Crookston, MN (US);
Abstract
The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate refiner so that a waste water stream is reduced in volume and has a pH within a range of 8 to 9. The present invention also comprises a HRC gel having a lignin concentration of at least about one (1)% by weight, and a water retention capacity of about 25 to at least about 56 g HO/g dry HRC.