Expired Canadian patentCanada
A process using cellulase for improving drainage properties of pulp
CA 2079442 C · Owner: Baret, Jean-Luc A. G. · Inventors: Baret, Jean-Luc A. G.; Leclerc, Marc
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the preparation of pulp for paper making the drainage properties can be , improved by treating the pulp with cellulase at high pulp consistency (above 8 %).
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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
- Filed March 21, 1991 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 21, 1991
GrantedSeptember 10, 2002
Term endedMarch 21, 2011
Patent numberCA 2079442 C
Classification (IPC)D21H21/10 +2 more
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.