System for logging a well during the drilling thereof
CA 2097430 C · Owner: Numar Corporation · Inventors: Miller, Melvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nuclear magnetic resonance well logging apparatus and a method of use for geophy-, sical examination of a bore hole as the bare hole is drilled. The apparatus is connected to, the drill bit (36) to follow it through the bore hole as the bore hole is formed. The apparatus, comprises a resilient tubular, permanent magnet (46),for generating a static magnetic field, in the region of portion of the bore hole adjacent the apparatus which region , includes ma-, terials sought to be analyzed an antenna (48) mounted an the magnet and connected to as-, sociated circuitry for exciting nuclei of the materials sought to be analyzed in the region, and a receiver connected to the antenna for …
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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 December 4, 1991 and granted June 24, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2013.
- 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.