Electric double layer capacitor
CA 2033255 C · Owner: Morohoshi, Hiroyoshi · Inventors: Tsuchiya, Yoshinobu; Morohoshi, Hiroyoshi; Kurabayashi, Ken
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
At least two powders of minute active carbon particles having different diameters are mixed and the mixture, is placed in a mold. While a pressure is being applied to the mixture in the mold, pulse voltages are applied between the minute active carbon particles for producing electric discharges therebetween, and the minute active carbon particles are kept at a predetermined temperature thereby sintering the minute active carbon particles into a porous sintered body, which is used as an electrode. Two such electrodes are impregnated with an electrolyte produc-, ing polarized electrodes. An electric double layer capacitor comprises the polarized electrodes which are sandwiched between current …
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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 December 27, 1990 and granted December 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 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.
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.