Separator for lithium ion secondary battery
CA 2425750 C · Owner: Daido, Takahiro · Inventors: Nishikawa, Satoshi; Daido, Takahiro; Honmoto, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A separator, used for a lithium ion secondary battery that produces electromotive force by lithium doping/dedoping which is composed of a porous film comprising an organic polymer (component A) which can swell in an electrolyte solution to retain it surrounding a nonwoven fabric which cannot swell in the electrolyte solution the porous film including an electrolyte solution non-swelling organic polymer with a melting point of 210°C or above (component B) and an electrolyte solution non-swelling organic polymer with a melting point of 180°C or below (component C) wherein component B is incorporated in the fiber composing the nonwoven fabric. The separator is highly safe and exhibits low …
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 15, 2003 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2025.
- 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.