Method for producing a ferromagnetic chromium oxide
CA 1046239 A · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Terada, Yukio; Hirota, Eiichi; Kawamata, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the production of a ferromagnetic chromium oxide comprising: preparing a mixture including chromium trioxide and an aqueous solution of hydrogen peroxide containing more than 0.05 percent by weight H2O2 based on the weight of chromium trioxide; heating said mixture at a rate in excess of 10°C/min. under an atmosphere of air, oxygen nitrogen or, inert gas at a pressure in the range of from 0.01 to 10 atmospheres, to a reaction temperature in the range of from 200°C to 600°C;, maintaining the mixture at the reaction temperature for a period of from 1 minute to 5 hours; subjecting the thus treated reaction mixture to furnace cooling or air quenching to room temperature; washing …
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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
- Granted January 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 16, 1996.
- 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.