Magnesium oxide coating for electrical steels and a method of coating
CA 2024226 C · Owner: Armco Advanced Materials Corporation · Inventors: Wright, Wade S.; Murphy, Robin A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Decarburized grain oriented silicon steel is provided with an annealing separator which forms a glass film after the final high temperature anneal. The, magnesia used as the annealing separator has a total chlorine level of 0.01 to 0.20% by weight based on the weight of magnesia with at least 0.01 % metal chloride selected from the group of Mg Ca, Na and K. The chloride addition, acts to seal the coating surface during the final anneal to control diffusion and, stabilize the secondary grain growth. The glass film which forms during the anneal may be laser scribed for domain refinement without coating damage. The magnesia may also contain additions of phosphates TiO2, SiO2, Cr and B. The, …
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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 29, 1990 and granted February 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.