Method for the preparation of fine hexagonal ferrite powders, in particular, for magnetic recording
CA 1252995 A · Owner: Consiglio Nationale Delle Ricerche · Inventors: Licci, Francesca; Besagni, Tullo; Rinaldi, Stefano
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method disclosed by which to prepare fine hexagonal ferrites for use in magnetic recording is one, which consists basically in dissolving a) carbonates or other soluble compounds of an aikaline earth metal such as strontium or barium, b) a carbonate or other soluble compound of cobalt, and c) titanium trichloride, all in a solution of ferric citrate and water whereupon a polycondensation is brought about by addition of ethylene clycol, and heat is applied to eliminate water and organic matter from the compound. Addition of the alkaline earth metal the cobalt and, the titanium is proportioned precisely on the basis of the stoichimetric properties of the end-product the formula for which …
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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 April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
- 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
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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.