Very low-density cement slurry
CA 2438463 A1 · Owner: Drochon, Bruno · Inventors: Drochon, Bruno; Kefi, Slaheddine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cement slurry having a density between 750 kg/m3 and 1,000 kg/m3 comprising , a solid fraction comprising: either 75%-90% (by volume) of lightweight particles having a mean particle size between 10 and 60 um; 10%-25% (by volume) of Portland cement havi ng a mean particle size of between 10 and 50 um, or micro-cement having a mean particle size between 0.5 and 5 um; or: 20%- 50% (by volume) of lightweight particles having a mean particle size between 10 and 60 um; 10%-25% (by volume) of Portland cement having a mean particle size of between 10 and 50 um, or micro-cement having a mean particle size between 0.5 and 5 um; 35%-65% (by volume) of lightweight particles having a mean par …
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 December 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2023.
- 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.