A device for monitoring of oil-water interface
CA 2525451 C · Owner: Norsk Hydro Asa · Inventors: Kong, Fan-Nian; Westerdahl, Harald; Johnstad, Svein Erling
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for monitoring the position of an oil/water contact (OWC 22) between , an oil-continuous fluid (2o) overlying a water-continuous fluid (2w) inside a casing pipe (7), comprising the following features: a transmitter (5) for a generating an electromagnetic signal (ST) said transmitter (5) provided with , electrical energy (GT) from a voltage signal generator (G); said transmitter (5) being arranged inside said oil-continuous fluid (2o) and being above said oil-water contact (22), and being inside said casing pipe (7); said electromagnetic wave signal (ST) for partly propagating downwards from said transmitter (5); said electromagnetic wave signal (ST) for being partly …
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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 March 19, 2004 and granted December 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2026.
- 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.