Preparation of .epsilon.-phase silver vanadium oxide from .gamma.-phase svo starting material
CA 2364825 A1 · Owner: Takeuchi, Esther S. · Inventors: Leising, Randolph A.; Takeuchi, Esther S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The current invention relates to the preparation of an improved cathode active material for non-aqueous lithium electrochemical cell. In particular the, cathode active material comprises .epsilon.-phase silver vanadium oxide prepared by using a .gamma.-phase silver vanadium oxide starting material. The reaction of .gamma.phase SVO with a silver salt produces the novel .epsilon.-phase SVO possessing a lower surface area than .epsilon.-phase SVO produced from vanadium oxide (V2O5) and a similar silver salt as starting materials. Consequently the low, surface area .epsilon.-phase SVO material provides an advantage in greater long term stability in pulse dischargeable cells.
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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 December 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2023.
- 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
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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.