Method and apparatus for acquiring and processing subsurface samples of connate fluid
CA 2128024 C · Owner: Western Atlas International, Inc. · Inventors: Michaels, John M.; Leder, John T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for use in formation testing instrument (13) for acquisition of a phase intact sample of connate fluid. One or more fluid sample tanks (26 28) contained within the instrument (13) are pressure balanced with respect to the wellbore at formation level and are filled with a connate fluid sample in such manner that during filling of the sample tanks (26 28), the pressure of the connate fluid is maintained within the predetermined range above the bubble point of the fluid sample. The sample tank (26, 28) incorporates an internal free-floating piston (46) which separates the sample tank into sample containing and pressure balancing chambers with the pressure balancing …
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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 November 15, 1993 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2015.
- 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.