Methods and apparatus for non-destructive testing of materials using longitudinal compression waves
CA 2038561 A1 · Owner: Talbot, Lionel · Inventors: Talbot, Lionel; Allaire, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The non-destructive testing of materials particularly, coarse grain materials such as the carbonaceous materials used in the anodes and cathodes of an aluminium smelting furnace using longitudinal compression waves employs a waveguide to apply the waves to a specimen, the and specimen having a cross-sectional dimension Dg of between 3 and 5 times the material average grain size Dg. Alternatively or in addition, the waves used preferrably are of effective wavelength from about 30Ds to 50Ds. Alternatively, or in addition the, effective wavelength of the waves is preferred to be approximately equal to the length of the sample; the necessary very long samples may be obtained by connecting a …
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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 March 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.