Enzymatic delignification of lignocellulosic material
CA 2019411 A1 · Owner: International Paper Company · Inventors: Bhattacharjee, Shyam S.; Gallagher, Hugh P.; Slocomb, John P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plural stage process for the enzymatic delignification of lignocellulosic materials for use in the pulp and paper industry comprising one or more ligninolytic enzyme treatment stages and one or more xylanase treatment stages. The ligninolytic enzyme preparation may comprise lignin peroxidases Mn(II)-dependent peroxidases, or both these enzymes.
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 June 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2012.
- 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.