Explosion-proof seal plate for sealed type cell and production method thereof
CA 2240415 C · Owner: Kashihara, Yoshihiro · Inventors: Hirakawa, Yasushi; Kashihara, Yoshihiro; Saito, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an explosion-proof seal plate for a sealed cell and a production method thereof and aims at providing an explosionproof seal plate and production method thereof wherein problems of a risk of, explosion of a cell due to an excessive pressure inside the cell caused by abnormal, generation of a gas through a chemical reaction accompanying over charge or erroneous use of the cell or damaging of electronic equipment using the cell as the, power source are solved, ignition and other accidents can be prevented with a high, accuracy by reliably cutting off an electric current when the cell internal pressure, increases, and the increase in the resistance due to …
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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 October 28, 1996 and granted December 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2018.
- 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.