Monopole, dipole, and quadrupole borehole seismic transducers
CA 2033593 A1 · Owner: Owen, Thomas E. · Inventors: Owen, Thomas E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various configurations of cylindrically shaped transducers (10) (160), and (190) are, used as borehole seismic wave sources. The basic class of transducers of this invention has an outer shell (12) that is generally cylindrical and may be comprised of cylindrical, sections (162) and (164); (192a) (192b), (194a), and (194b). The shell (12) or the sections (162) and (164); (192a), (192b), (194a) and (194b) may be pre-stressed or preformed to, encourage certain bending motions. Depending on the configuration of the transducer it, approximates a monopole(10),dipole(160) or quadrupole(190)radiator. Various actuating means (132), (142), and (152), including magnetostrictive forces and …
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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 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2013.
- 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.