Drilling fluids and muds containing selected ester oils
CA 2006009 C · Owner: Baroid Limited · Inventors: Mueller, Heinz; Von Tapavicza, Stephan; Grimes, Douglas John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Invert emulsion muds for drilling of gas and oil which are environmentally safe, and which contain: A. a continuous oil phase composed predominantly of at least one monocarboxylic acid ester of a C2C12 monofunctional alkanol wherein the monocarboxylic acid contains from 12 to 16 carbon atoms and is aliphatically saturated, B. a disperse aqueous phase C. at least one emulsifier, D, at least one weighting agent E, at least one fluid loss additive, and F. a mild alkaline reserve.
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 December 19, 1989 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2011.
- 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.