Compositions and methods for curing concrete
CA 2308237 A1 · Owner: Sun, Robert Keith · Inventors: Sun, Robert Keith; Liang, Roland Tak Yong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An internal curing composition for concrete includes a glycol and a wax. The glycol is preferably polyethylene glycol and the wax is preferably paraffin wax. When added to concrete, the composition facilitates the curing of concrete to a, low porosity, high compressive strength product.
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 May 5, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2022.
- 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.