Method and apparatus for discontinuity detection in magnetisable material
CA 2107368 A1 · Owner: Drury, John Charles · Inventors: Drury, John Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus are disclosed for detecting discontinuities (such as pits or cracks) at or below the surface of magnetisable material. An array of sensors is provided at or near the surface of a material arranged to detect magnetic flux leakage occurring when a magnetic field is induced in the material. The sensors in the array are coupled in respective pairs (differential pairs) such that when one member of a respective pair overlies a discontinuity, a differential output signal is produced dependent on the difference between the output signals from the sensors comprising the respective differential pair. Warning means is actuated in response to the differential output signal on …
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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 February 5, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2015.
- 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.