Preparation of battery cell current collectors
CA 2273590 A1 · Owner: O'Brien, Richard Philip · Inventors: Keeler, Anthony H.; O'Brien, Richard Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
At least portions of steel battery casings or other current collectors in contact with a manganese dioxide layer in a zinc-manganese dioxide alkaline cell present to that layer surfaces which have been burnished in the presence of particles of a passivity inducing metal such as nickel. Typically the particles are transferred from a plating layer on a surface of low carbon steel forming the casing by a machining operation which cuts into the surface to increase its surface area whilst burnishing the cut surfaces.
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 June 2, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 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.