Method of reducing fluid loss in cement compositions
CA 2076332 A1 · Owner: Childs, Jerry D. · Inventors: Childs, Jerry D.; Burkhalter, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cementing compositions having improved fluid loss capabilities, improved corrosion resistance improved settling, characteristics for use in elevated temperature environments in subterranean formation cementing operations are disclosed. More particularly such compositions include water, hydraulic cement, a styrene/butadiene latex, the styrene to butadiene being present in a ratio of 10/90 to 90/10 by weight and a surfactant comprising a salt of a C12-15 Pareth 10-40 sulfonate. For use at temperatures above 200°F a stabilizer and retarder comprising a selected copolymer of (AMPS?/acrylic acid also preferably is present (AMPS? is a trademark of The Lubrizol Corporation for …
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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 August 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2014.
- 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
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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.