Seal electrical conductor arrangement for use with a well bore in hazardous areas
CA 2246400 C · Owner: Moore, Boyd B. · Inventors: Moore, Boyd B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an apparatus for conducting alternating current through a well barrier made substantially entirely of ferromagnetic material. The apparatus is comprised of at least one non-ferromagnetic electrically conductive rigid tube extending through its own separate passageway in the well barrier; and a single electrical conductor carrying the alternating current extending through the well barrier enclosed by each rigid tube. The electrical conductor includes insulation electrically isolating the rigid tube from the conductor.
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 April 29, 1993 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 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
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.