Delayed thixotropic cement compositions and methods
CA 2352685 A1 · Owner: Vijn, Jan Pieter · Inventors: Dao, Bach; Vijn, Jan Pieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Delayed thixotropic cement compositions and methods of cementing in subterranean, zones penetrated by well bores are provided. The novel cement compositions are basically, comprised of a hydraulic cement sufficient water to form a slurry and a water soluble, delayed thixotropy imparting additive selected from the group consisting of carbonic acid and, alkali metal carbonates.
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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 July 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 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.