Expired Canadian patentCanada
Method for preserving wood
CA 2219853 C · Owner: Gb Biosciences Corporation · Inventors: Battershell, Robert D.; Jacobson, Barry M.; Abraham, Ann C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for preserving wood comprising infiltrating the wood with gaseous carbon disulfide and impregnating the wood with an aqueous solution comprising a copper source, and dimethylamine.
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 October 31, 1997 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 31, 1997
GrantedAugust 7, 2001
Term endedOctober 31, 2017
Patent numberCA 2219853 C
Classification (IPC)B27K3/34 +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.