A method for producing positive electrode material and lithium batteries incorporating this material
CA 2175856 C · Owner: Nippon Telegraph & Telephone Corporation · Inventors: Yamaki, Jun-Ichi; Arai, Hajime; Sakurai, Yoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A positive electrode material for use in lithium batteries contains a compound represented by the chemical formula LixFe2(SO4)3 (0<x ? 2). This positive electrode material is made from low cost material which is available in abundant quantities. Moreover a lithium battery using this material has a large discharge energy and long cycle life.
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 May 6, 1996 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 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.