Coinage material and process for production thereof
CA 2214613 A1 · Owner: Diffusion Alloys Limited · Inventors: Hatherley, Peter; Kempster, Adrian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coinage material comprises a ferritic blank for example of mild steel, which has been surface-treated with an austenite-forming element such as nickel or manganese and, which has chromium diffused into the surface such that a specific, marked difference for example in electrical conductivity and/or magnetic permeability which is, electronically detectable exists between the surface and the interior. The coinage material may therefore be validated electronically using suitable detection means.
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 September 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 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.