Carbonaceous powder for electrorheological fluid and a method of making the same
CA 2020679 C · Owner: Hatano, Hitomi · Inventors: Maruyama, Takayuki; Torii, Takayuki; Saito, Tasuku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrorheological fluids display swift and reversible increase in apparent viscosity under application of an electric potential difference to the fluid, and are composed generally of electrical insulating oily medium and dielectric fine-particles dispersed therein. In one of its aspects the present invention relates to a, carbonaceous powder for electrorheological fluid which can be employed as dielectric fine-particles to be dispersed in the oily medium and a method of making the carbonaceous powder. The carbonaceous powder for electrorheological fluid of the present invention comprises a carbonaceous powder having a number ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and …
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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 July 6, 1990 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 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.
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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.