Expired Canadian patentCanada
Alkaline battery
CA 2181272 C · Owner: Kojima, Yuri · Inventors: Mototani, Yuji; Noya, Shigeto; Asaoka, Junichi
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alkaline battery using a mercury free zinc alloy powder as an anode active material is disclosed. It has a gelled anode which comprises silicon and zinc alloy powder containing at least one of bismuth aluminum and, calcium.
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 15, 1996 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 15, 1996
GrantedFebruary 8, 2000
Term endedJuly 15, 2016
Patent numberCA 2181272 C
Classification (IPC)H01M4/24
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.