A method of probing drill holes electromagnetically, and a transmitter arrangement and a receiver arrangement for carrying out the method
CA 2272060 C · Owner: Ederlov, Per · Inventors: Nilsson, Per; Ederlov, Per; Pantze, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method and to a transmitter arrangement for the probing of drill holes (4). The transmitter includes a ground-located conductor loop (1) which is supplied with a current that has a wave shape which includes at least one low frequency (e.g. 200-3000 Hz). The frequency is crystal controlled and normalised to time signals from GPS satellites. The receiver includes coils which function to sense field changes having the same frequencies as the transmitter and is housed in the probe (6) said probe , being lowered with the aid of a typical drill pipe (5) and lacks signal connection with the transmitter. Instead the probe includes an accurate , quartz clock which …
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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 September 21, 1998 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.