Method of creating a borehole in an earth formation
CA 2181065 C · Owner: Shell Canada Limited · Inventors: Mulder, Elvira Hendrika; Hartmann, Robin Adrianus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of creating a borehole in an earth formation is provided in a , selected direction relative to an adjacent borehole formed in the earth formation. The method comprises arranging electromagnetic source means in a first of said boreholes at a plurality of locations along the length thereof said electromagnetic source means inducing an electromagnetic field extending into a second of said boreholes. Electromagnetic field measuring means are arranged at a selected depth di in the second borehole said measuring means , being capable of measuring said electromagnetic field. The measuring means are operated so as to measure said electromagnetic field and from the measured , …
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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 January 12, 1995 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2017.
- 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.