Method for the production of acetylated wood
CA 2507697 A1 · Owner: Hoeglinger, Otmar · Inventors: Tanczos, Ildiko; Bucka, Hartmut; Stallinger, Stefan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is acetylated wood which has an acetyl group content of 3 to 30 percent by weight and can be produced by reacting wood products with isopropenyl acetate at temperatures of 50 to 125 ~C in the presence of 0.02 to 2 percent by weight of acid catalysts, the percentage being in relation to the used isopropenyl acetate. The reaction with isopropenyl acetate can take place in a liquid phase or gas phase. The acetylated wood produced according to said method is suitable for wood products requiring high dimensional stability and extended natural durability.
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 November 27, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 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.