Process for post-treatment of preservative-treated wood
CA 2048494 C · Owner: Omg Americas, Inc. · Inventors: Hein, Richard W.; Kelso, William C. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title: AN IMPROVED PROCESS FOR POST-TREATMENT OF PRE- SERVATIVE-TREATED WOOD, Abstract of the Disclosure An improved process for post-treatment of oil-borne preservative treated wood is described. More particularly the improved process comprises, in one embodiment the steps of, (A) contacting the preservative-impregnated wood in a closed vessel with steam and collecting a water condensate generated in the vessel; (B) applying a vacuum which is sufficient to allow refluxing of the water condensate to remove at least some surface deposits and distillation of the water out of the vessel;, (C) releasing the vacuum; (D) recovering the post-treated wood from the vessel. The invention uses a …
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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 August 6, 1991 and granted February 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2013.
- 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.