Electromagnetic resistivity tool and method for use of same
CA 2259760 A1 · Owner: Halliburton Energy Services, Inc. · Inventors: Smith, Harrison C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for obtaining resistivity readings of the earth surrounding a wellbore (32) to determine the downhole location of the apparatus or to generate a log is disclosed. The apparatus comprises an electromagnetic transmitter (40) for transmitting electromagnetic waves (42 46) into the earth and an electronics package (122). The electronics package includes a power source (200) providing a current to the electromagnetic transmitter (40), a current sensing device (204) for detecting the current drawn by the electromagnetic transmitter (40) a sample and hold circuit (210), for sampling the current drawn by the electromagnetic transmitter (40) and a memory device (214) for storing the …
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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 January 19, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2021.
- 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.