Direct biological bleaching of hardwood kraft pulp with the fungus coriolus versicolor
CA 1266014 C · Owner: Pulp And Paper Research Institute Of Canada · Inventors: Ho, Ka-Kee; Bourbonnais, Robert E.; Jurasek, Lubomir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a process for bleaching kraft hardwood pulp wherein the bleaching is done utilizing the fungus, Coriolus versicolor wherein the pulp is treated with the fungus at a temperature and for a time sufficient for the bleaching to occur. The pulp may subsequently be sterilized after bleaching.
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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 February 20, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 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.