Expired Canadian patentCanada
Process for the delignification of a cellulose- containing material with an oxidizing gas in an aklaline milieu
CA 1088261 A · Owner: A. Ahlstrom Osakeyhtio · Inventors: Sjostrom, Eero V.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Delignification of a lignocellulosic material is effected by means of an oxygen containing gas in an alkaline aqueous solution containing a water-soluble oxygen-transferring agent at an elevated temperature.
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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 October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 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.
FiledMarch 17, 1976
GrantedOctober 28, 1980
Term endedOctober 28, 1997
Patent numberCA 1088261 A
Classification (IPC)D21C3/02 +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.