Well cementing methods and compositions
CA 2431477 A1 · Owner: Eoff, Larry S. · Inventors: Eoff, Larry S.; Keener, Krista L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods of cementing subterranean zones penetrated by well bores and well cement, compositions are provided. A well cement composition of the invention is basically, comprised of a hydraulic cement water in an amount sufficient to form a pumpable slurry, and a fluid loss control polymer additive comprised of 69 weight % of the calcium salt of 2-, acrylamido-2-methyl propane sulfonic acid 14 weight % of the calcium salt of , maleic acid 14 weight % of N-vinyl caprolactam and 3 weight % of 4-hydroxybutyl vinyl ether.
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 June 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 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.