Cement composition exhibiting improved resilience/toughness and method for using same
CA 2436378 C · Owner: Reddy, B. Raghava · Inventors: Morgan, Rickey L.; Reddy, B. Raghava; Ravi, Krishna M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cement composition for use in borehole applications comprising hydraulic cement sufficient water to form a slurry, and an effective amount of a resilience/toughness enhancing additive comprising a thermoplastic block copolymer having a tensile strength of from 500 to 4000 psi a recoverable elongation of 200 to 1000 percent and exhibiting temperature stability in the range of 30° to 500°F the cement composition being useful for forming seals at desired locations in wellbores or formations penetrated by wellbores by placing the composition in the desired location and permitting the composition to set.
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 August 4, 2003 and granted October 11, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 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.