Process for producing pulp in the presence of a quinone compound
CA 1079906 A · Owner: Honshu Seishi Kabushiki Kaisha · Inventors: Wakai, Makoto; Nomura, Yoshika; Sato, Haruo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure: There is disclosed a process for producing pulp comprising subjecting lignocellulosic material to chemical cooking treatment and optionally to further mechanical defibration, the improvement in which a small amount of a quinone compound is present in the cooking treatment whereby the removal of lignin from the lignocellulosic material is promoted while hydrolysis of hemicellulose is prevented to obtain pulp having superior properties in high yield. - 1 -
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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 June 24, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 1997.
- 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.