Battery separators
CA 2109400 A1 · Owner: Degen, Peter J. · Inventors: Lee, Joseph; Degen, Peter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery separator comprising an ultra-high molecular weight polyethylene microporous membrane radiation grafted with a monomer, the separator having the following properties: `, (a) a porosity ranging from about 50% to about 95% (b) an average pore size ranging from about 0.1 to about 20 microns, (c) an electrolytic resistance ranging from about 1 to about 50 m.OMEGA.-in2, (d) a maximum weight loss of 1% and a change in electrolytic resistance of no greater than 25% after immersion in an aqueous solution of 35% KOH and 5% KMnO4 at 50°C for 1 hour, (e) a tensile strength of from about 3.5 to about 5.5 lb/in in both length and width directions (f) a KOH absorption ratio of from about 5 to …
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 October 27, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2015.
- 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.