Alkaline dry battery
CA 2463849 A1 · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Shoji, Yasuhiko; Adachi, Mitsuji; Umebayashi, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alkaline dry cell which is excellent in heavy and medium load discharge characteristics and the light load discharge characteristics of which hardly degrade. The alkaline dry cell comprises a negative electrode an alkaline , electrolyte, and a positive electrode containing manganese(IV) oxide and graphite powder. An additive selected from the group of Ti(OH)4 and Ti(OH)2 is added to the positive electrode.
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 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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.