Magnetic fluid and process for the production thereof
CA 2304229 A1 · Owner: Atarashi, Takafumi · Inventors: Fujita, Toyohisa; Atarashi, Takafumi; Kim, Young-Sam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic fluid which can work powerfully and at high precision under the action of an external magnetic field, is remarkably increased in the viscosity by applying an external magnetic field and regulating it can be controlled in , the viscosity easily and accurately is excellent in the oxidation resistance of the particles and the dispersibility thereof and exhibits satisfactorily , large viscosity characteristics; and a process for the production of the same. The fluid is characterized in that magnetic metal particles covered with antioxidant films are stably dispersed in a solvent and that the stable dispersion is maintained, and the process is characterized by forming oxide …
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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 September 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2020.
- 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.