Method of making cement from tailings or rock fines containing silicate or siliceous compounds
CA 2309233 A1 · Owner: Berardi, Roberto · Inventors: Krofchak, David; Berardi, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making cement from tailings or rock fines containing silicate or siliceous, compounds includes grinding the tailings or rock fines to a size in the range of from about, -250 to about 425 mesh to produce ground pozzolan. The ground pozzolan is mixed with, Type 1 normal Portland cement or Type 3 high early strength Portland cement in a ratio of, at least about 0.5:1 by weight to produce a blended cement.
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 24, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 24, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 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.