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. 15, 1992
Filed:
Mar. 01, 1991
Applicant:
Inventor:
Xuan T Nguyen, Montreal, CA;
Assignee:
Domtar Inc., Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162-7 ; 162-8 ; 162 3011 ;
Abstract
Waste cellulosic material, for example corrugated paperboard is cooked in an aqueous alkaline cooking liquor to produce a brownstock pulp having a kappa number lower than that of the waste material; combustion of organic materials in the brownstock washing liquor provides heat energy which can be recovered for use in the cooking process and residual inorganic chemicals of the liquor can be employed to prepare fresh cooking liquor; the recycled pulp can be employed as the sole pulp component of brown paper products, or can be bleached to provide a pulp for white paper products.