Battery separator
CA 2434353 A1 · Owner: Simmons, Donald K. · Inventors: Ogura, Shizuo; Wei, Xiangyun; Simmons, Donald K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1.7 mils a Gurley of less, than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.
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 July 4, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 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.