Non-aqueous secondary battery and a manufacturing method of graphite powder
CA 2173765 C · Owner: Horiba, Tatsuo · Inventors: Honbo, Hidetoshi; Momose, Hideto; Muranaka, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carbon material having a superior reversibility in the lithium intercalation-deintercalation reaction is used in a non-aqueous secondary battery as the active material for the negative electrode. The result is a high energy density and excellent rapid charging and discharging characteristics. Graphite powder having a maximum particle diameter of less than 100 µm and a fraction of rhombohedral structure in the crystalline structure of less than 20% is used as the active material for the negative electrode of the battery. This graphite powder can be obtained by pulverizing raw graphite with a jet mill and subsequently treating the powder at a temperature equal to or higher than 900°C.
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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 April 10, 1996 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 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.