Method and apparatus for exploring subsoil involving the emission of a series of seismic pulses

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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 16, 1992 and granted November 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2012.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2014.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.