Magnetofluid with high saturation magnetisation
CA 2219503 C · Owner: Rehfeld, Armin · Inventors: Rehfeld, Armin; Muller, Johannes; Buske, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has been the task of the invention to form a magnetofluid with a high saturation magnetisation which has a saturation concentration that lies above 100 mT in order to be able to transmit higher forces. According to the invention this is attained by stably dispersing cobalt and nanometer particles modified with mono-molecular adsorption layers in carrier liquids, whereby the volume concentration of the ferromagnetic component comes to 5 to 35 per cent, preferably to 15 to 30 % and the, volume concentration of the modified particles (naked particles with adsorption shell) comes up to 50 per cent by volume.
Read the whole patent
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 February 27, 1997 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2019.
- 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.