Non-circular fiber battery separator and method
CA 2265117 A1 · Owner: Danko, Thomas · Inventors: Danko, Thomas; Oxley, Jeffery Allen; Dinh-Sybeldon, Ann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery separator of a nonwoven substrate coated on at least one surface with a, cellulose film made from a liquid cellulose or cellulose derivative solution with the substrate, having at least 50% by wt. noncellulosic fibers having a noncircular crosssectional perimeter, which has a percentage cross-sectional area difference relative to a circumscribed circle, according to the formula: (see formula I), wherein A = Area of a noncellulosic fiber cross-section; and B = Area of a circle, circumscribing said fiber cross-section and preferably, having an absorption , rate of at least 15, most preferably at least 30 mm/10 min. in an aqueous solution of 40 wt. % KOH.
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 March 10, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2021.
- 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.