Stable well cementing methods and compositions
CA 2432875 A1 · Owner: Cromwell, Roger S. · Inventors: Crook, Ronald J.; King, Bobby J.; Brenneis, Darrel C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides stable well cementing methods and compositions for, sealing subterranean zones penetrated by well bores. The improved thermally stable and, degradation resistant well cement compositions are basically comprised of a hydraulic cement, sufficient water to form a pumpable slurry an aqueous hydrogenated styrene-, butadiene rubber latex and a latex stabilizer present in an amount sufficient to stabilize the hydrogenated styrene-, butadiene latex.
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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 June 20, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2025.
- 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.