Method and apparatus for regional gravity surveys
CA 2213555 C · Owner: Seigel, Harold O. · Inventors: Seigel, Harold O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for conducting regional gravity surveys comprising a, gravimeter module suspended below a helicopter and adapted to be lowered to the earth's surface for generating gravimeter readings The gravimeter module includes an, automatic reading gravimeter sensor and a mechanism for self-levelling of the sensor. A ground contact sensor is provided for determining when the gravimeter module contacts the earth's surface as a result of being lowered thereto and for determining when the gravimeter module ceases contacting the earth's surface as a result of being raised therefrom. The ground contact sensor generates a time marker indicative of these events. A GPS receiver is mounted …
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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 August 21, 1997 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2019.
- 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.