Magnetic materials and process for producing the same
CA 2034496 A1 · Owner: Sps Technologies, Inc. · Inventors: Bogatin, Yakov
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for producing a rare earth-containing material which is resistant to oxidation and non-pyrophoric comprising treating the rare earth containing material with a passivating gas at a temperature below the phase transformation temperature of the alloy. Rare earth-containing alloys suitable for use in producing magnets utilizing the powder metallurgy technique, such as Nd-Fe-B and Sm-Co alloys can be used. The, passivating gas can be nitrogen carbon dioxide or a combination of, nitrogen and carbon dioxide. If nitrogen is used as the passivating gas, the resultant rare earth material surface concentration of from 0.4 to about 26.8 atomic percent. If carbon …
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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 June 13, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 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.
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.