Process for producing high yield bleached cellulose pulp
CA 1266152 C · Owner: Lindahl, Jonas A.I. · Inventors: Lindahl, Jonas A.I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
16-281, Case 1462, A PROCESS FOR PRODUCING HIGH YIELD BLEACHED CELLULOSE PULP ABSTRACT OF THE DISCLOSURE, A process is provided for producing high yield bleached cellulose pulp, such as groundwood pulp thermomechanical pulp, chemimechanical pulp and waste paper pulp having a broad field of, use, which comprises bleaching cellulose pulp thinning the pulp to a, low pulp consistency; mechanically working the pulp; and fractionating the cellulose pulp into a long-fiber fraction and a fine-fiber fraction the freeness of the long-fiber fraction exceeding the freeness of the fine-fiber fraction by from about 150 to about 600 ml C. S. F. and the fine-fiber fraction constituting from about 35 to …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 27, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.