Manufacturing of zinc-alkaline batteries
CA 2090146 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Miura, Akira; Ohta, Akira; Sugihara, Sachiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-pollution zinc-alkaline battery excellent in storage stability can be obtained by using in formu-, lation for negative electrode a zinc alloy which, contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum which is free from mercury, lead, cadmium indium and, thallium is used as an active material and yttrium hydroxide or yttrium oxide optimized in a starting material therefor, particle size and weight loss on heat decomposition as an inorganic inhibitor. The storage stability of the battery can be further improved by adding to the above formulation for a negative electrode a proper amount of a surfactant having a polyethylene oxide …
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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 February 23, 1993 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 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.