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:
Jul. 25, 2006
Filed:
Dec. 26, 2002
Brian Wester, Sumner, WA (US);
Michael D. Vrbanac, Seattle, WA (US);
Julie A. Reimer, Seattle, WA (US);
Peter K. Lau, Kamloops, CA;
Brian E. Dennis, Kamloops, CA;
David W. Bickell, Kamloops, CA;
Brian Wester, Sumner, WA (US);
Michael D. Vrbanac, Seattle, WA (US);
Julie A. Reimer, Seattle, WA (US);
Peter K. Lau, Kamloops, CA;
Brian E. Dennis, Kamloops, CA;
David W. Bickell, Kamloops, CA;
Weyerhaeuser Company, Federal Way, WA (US);
Abstract
A process for making a pulp product that has a low COD is comprised of soaking and washing pulp in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 2.0 kg/1000 kg of dry pulp. The process includes repetitively soaking and washing an unbleached pulp in alkaline water that is never allowed to drop below pH 7.0. In this process, the pulp is soaked and washed for a total of at least 220 minutes at an elevated temperature to produce the pulp product that has a low COD.