Lithium secondary battery and cathode composition therefor
CA 2243196 C · Owner: Horiuchi, Hiroshi · Inventors: Tsutsumi, Masami; Horiuchi, Hiroshi; Watanabe, Isao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lithium secondary battery includes a cathode which can be dischargeably charged with lithium ions an anode made of lithium metal, a lithium alloy or any other anode material which can be releasably doped with lithium ions an electrolyte which allows migration of lithium ions between both electrodes and an endothermic substance which undergoes an endothermic reaction upon a temperature rise of the battery for preventing excessive heat generation. Typically the endothermic substance is a metal carbonate such as magnesium carbonate cobalt (II) carbonate, silver carbonate cadmium carbonate or sodium hydrogencarbonate.
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 July 14, 1998 and granted December 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2020.
- 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.