Thermostable xylanase dna, protein and methods of use
CA 2129172 C · Owner: Brzezinski, Ryszard · Inventors: Ethier, Jean Francois; Brzezinski, Ryszard; Dery, Claude V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is for a method of chemically treating plant biomass with an enzyme system that retains function at low pH and high temperature. Enzyme preparations enriched in xylanase enzymes which retain activity in low pH and high temperature are described. Such preparations may be utilized in a crude unpurified form and are especially useful in the production of pulp and paper.
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 July 29, 1994 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2016.
- 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.