Use of selected oleophilic alcohols in water-based drilling fluids of the o/w emulsion type and corresponding drilling fluids with improved ecological acceptability
CA 2057005 C · Owner: Herold, Claus-Peter · Inventors: Fues, Johann Friedrich; Mueller, Heinz; Von Tapavicza, Stephan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use is disclosed of at least substantially water-insoluble mono-and/or polyfunctional alcohols of natural and/or synthetic origin which are fluid and/or at least plastically deformable at working temperature and have flash points of at least 80°C or corresponding, solutions of mono- and/or polyhydric alcohols in ecologically acceptable water-insoluble oils as the dispersed oil phase of water-based O/W-emulsion drilling fluids which are suitable for an, environmentally-acceptable development of geological formations and which, if desired, contain insoluble, finely particulate weighting agents for the formation of water-based O/W-emulsions drilling muds and/or further additives, such as …
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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 May 7, 1990 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.