A lithium secondary battery
CA 2204927 C · Owner: Yamamoto, Masahiro · Inventors: Yamamoto, Masahiro; Sakai, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an improved lithium secondary battery comprising a negative, electrode using as an active material at least one member selected from the group, consisting of metallic lithium, lithium alloys and materials which are capable of, electrochemically occluding and releasing lithium ions a positive electrode , using as an, active material at least one compound which is capable of electrochemically occluding, and releasing lithium ions, and an organic electrolyte comprising a lithium salt dissolved, in a solvent composition wherein the solvent composition for the organic electrolyte, comprises a solvent mixture prepared by mixing (1) an organic solvent represented by, Formula i, …
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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 May 9, 1997 and granted May 27, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2019.
- 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.