Electronic blast control system for downhole well operations
CA 2133161 C · Owner: Anderson, Otis R. · Inventors: Anderson, Otis R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A method and apparatus for safely controlling detonation of a downhole explosive energized device which ensures that the explosive can be detonated in a well bore only when downhole hydrostatic pressure and well fluid temperature are within limits reflecting location of the explosive energized device at designed depth for accurate positioning relative to a selected formation. The apparatus further employs a clock/timer circuit and a motion sensor circuit to ensure firing of the explosive device only within a predetermined time period and only after having remained stationary within the well casing for a predetermined period of time The apparatus further includes a memory circuit which …
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.
Why it's free to use
- Filed September 28, 1994 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2016.
- 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.