Focused very high frequency induction logging
CA 1235743 A · Owner: Shell Canada Limited · Inventors: Hagiwara, Teruhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved very high frequency induction log is obtained using a tool having a focused transmitter source. The tool utilizes a second transmitter placed on the opposite side of the receivers from the first transmitter, the second transmitter being supplied with current to produce an opposite antenna current direction to the first transmitter. The combination of the two transmitters serves to focus the current flow and increase the depth of investigation.
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
- Granted April 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2005.
- 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.