Expired Canadian patentCanada
Process for producing paper or paperboard with increased strength from mechanical pulp
CA 2136068 C · Owner: Hansen, Tomas Tage · Inventors: Hansen, Tomas Tage; Nielsen, Peder Holk
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing paper or paperboard from mechanical pulp wherein the , pulp is treated with a phenol-oxidizing enzyme system after the grinding and/or refining of logs or wood chips has been completed.
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
- Filed May 18, 1993 and granted March 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 18, 1993
GrantedMarch 11, 2003
Term endedMay 18, 2013
Patent numberCA 2136068 C
Classification (IPC)D21H11/20 +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.