Cooking aid for improving the removal of extractives in pulp production, its production and use
CA 2510952 C · Owner: Ravaska, Matti · Inventors: Ravaska, Matti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a wood cooking aid which comprises a mixture of fatty acids and rosin acids and/or salts thereof in a ratio which is effective in removing the extractives in pulp production. The invention also relates to a method for preparing a wood cooking aid wherein fatty acids and rosin acids are provided in a mixture in a ration which is effective in removing the extractives in pulp production. If desired salts of said acids are prepared by reacting said fatty acid rosin acid mixture containing the desired fatty acid and rosin acid distribution with water and sodium hydroxide. The wood cooking aid of the invention is used in cooking of hardwood.
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 December 16, 2003 and granted July 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 16, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2025.
- 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.