Electric double layer capacitor
CA 2033256 C · Owner: Niida, Yoriaki · Inventors: Niida, Yoriaki; Tsuchiya, Yoshinobu; Kurabayashi, Ken
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric double which utilizes the principles of an electric double layer in the interface between polarized electrodes and an electrolyte, each of the polarized electrodes being composed of minute active carbon particles of coal tar which have a specific surface area ranging from 1,000 to 4,000 m2/gram. Many such minute active carbon particles are packed in a unit volume for an increased electrostatic capacitance.
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 December 27, 1990 and granted May 10, 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.