Compositions for use in concrete and concrete products obtained therefrom
CA 2268625 A1 · Owner: Leed, Cliff James · Inventors: Leed, Cliff James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glass in a fine particulate state is used as an aggregate for concrete products. The glass has a significant number of particles less than 150 microns. The glass is preferably combined with slag more preferably after being fused together and then crushed to the required particle size. Products of the invention can have various desired properties such as imperviousness to water and acid and be resistant to alkali/silica degradation while retaining adequate strength. The preferred compositions are impervious to water and acid, are resistant to alkali/silica degradation and reach high strength rapidly on setting.
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 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 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.
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.