Method for providing uniform subsurface coverage in the presence of steep dips
CA 2188255 C · Owner: Western Atlas International, Inc. · Inventors: Beasley, Craig J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for minimizing non-uniform insonification of subsurface formations in the presence of steep dips (F) when advancing a swath of elongated parallel seismic streamer cables (13) along a line of survey. A first acoustic source (SL) is stationed at the leading end of the swath and a second source (ST) is stationed at the trailing end of the swath. The sources (SL ST) are activated in alternative, cycles at preselected timed intervals (20 29) to provide down-dip and up-dip seismic data sets. The data sets are processed and merged to eliminate objectionable shadow zones.
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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 April 18, 1996 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2018.
- 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
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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.