Sub-audio magnetics instrument
CA 2084656 C · Owner: University Partnerships Pty Ltd. · Inventors: Cattach, Malcolm K.; Lee, Stephen J.; Stanley, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and a device for, implementing the method. for geophysical surveying of an area (1), comprising continuous measurement of the earth's magnetic or, electromagnetic field using a detector (6) held at a constant height (E), above the ground surface in the, order of one metre, while traversing in a criss-cross manner over the, area (1) at speeds below a maximum speed (S), in the order of 10, km/h, and utilising measured signal frequencies below a cutoff (F), being approximately the maximum speed (S) divided by twice the, detector height (E) to indicate spatial, changes in the measured field. Traversal distance can be measured on board the host vehicle and a real, time output supplied. …
Read the whole patent
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 June 3, 1991 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.