Method and apparatus for performing acoustic investigations in a borehole
CA 1330586 C · Owner: Mcdaniel, Gordon · Inventors: Randall, Curtis; Plona, Thomas; Chang, Shu-Kong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and Apparatus for Performing Acoustic Investigations in a Borehole, Abstract, An apparatus for performing acoustic investigations of subsurface geological formations penetrated by a borehole is disclosed to include a longitudinally extending body a transmitter carried by, said body for transmitting acoustic energy at a frequency chosen to fall within a natural transmission stop band exhibited by the body and an acoustic energy receiver carried by the body and spaced from the transmitter for receiving acoustic energy at the chosen frequency. The body includes, intermediate the transmitter and receiver, a periodic array of sections that have different acoustic propagation …
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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
- Granted July 5, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2011.
- 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.