Method to reduce scaling due to freezing and thawing in concrete
CA 2104026 C · Owner: Domtar Inc. · Inventors: Berthelot, Chantal; Malric, Bernard; Beaudoin, Rejean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A concrete, more especially a non-reinforced concrete has at least a residual amount of sodium fluorophosphate which reduces scaling of the concrete, when the concrete is subjected to freezing and thawing. A method to reduce scaling of concrete due to freezing and thawing comprises contacting the concrete with a system containing at least sodium fluorophosphate.
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 6, 1992 and granted September 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 2014.
- 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.