Anti-sapstain wood treatment
CA 2009075 C · Owner: Rohm And Haas Company · Inventors: Hegarty, Bryan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use is disclosed of one or more of (a) a polyquaternary compound, (b) a thickening agent or dispersing agent (c) a nonionic surfactant having from 3 to 12 alkylene oxide, preferably ethylene oxide units, and, (d) a simple quaternary compound in an amount at least equal to the amount of isothiazolone in the solution, to prevent stripping of isothiazolone in an isothiazolone-containing solution used as an anti-sapstain agent in wood treatment, where the solution is recurrently contacted with wood.
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 February 1, 1990 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2012.
- 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.