Sodium sulfur cell and process of manufacturing the same
CA 2021708 C · Owner: Ohshima, Masaaki · Inventors: Yoshida, Akihiko; Kobayashi, Akira; Ohshima, Masaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sodium sulfur cell comprising a cathode of metallic sodium, an anode of sulfur or sodium polysulfide, and beta alumina tube solid electrolyte separator containing water in an amount of not more than 0.3 mg per cm2 of the surface area of the beta alumina tube. This cell has a prolonged electromotive life and maintains reliable characteristics for a long time. The cell can be manufactured by conducting heating to remove water from the beta alumina separator after sintering.
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 20, 1990 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 20, 2012.
- 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.