Lithium secondary cell
CA 2301585 A1 · Owner: Takeuchi, Seiji · Inventors: Itabashi, Takeyuki; Kaneda, Junya; Muranaka, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lithium secondary cell produced by a method comprising forming copper oxide whiskers on the surface of a copper thin sheet on which negative plate active material is stuck, reducing the whole or part of the copper oxide chemically or electrically, and if necessary plating the copper sheet with nickel so as to form acicular projections on the surface. The lithium secondary cell is immune from the disadvantage that conventional lithium secondary cells deteriorate because of the properties of the copper negative plate collector. Further the lithium secondary cell is excellent in charging/discharging cycle characteristics.
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 April 22, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2021.
- 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.