Alkaline dry battery
CA 2453266 A1 · Owner: Sumiyama, Shinichi · Inventors: Noya, Shigeto; Sumiyama, Shinichi; Okubo, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alkaline dry battery which is low in the possibility of electrolyte leakage and excellent in discharge performance and which is not likely to cause , internal shorting wherein zinc powder includes 65-75 wt.% of first zinc particles having particle sizes larger than 75 µm and up to 425 µm and , 25-35 wt.% of second particles having particle sizes up to 75 µm.
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 May 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2024.
- 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.