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Expired Canadian patentCanada

Electrochemical cell using a dithionite radical of an alkaline metal as the charge transfer agent

CA 1114894 A · Owner: Maritime Commercial & Trading Corporation · Inventors: Schwartz, Ralph E.

CIPO record

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Abstract From the Canadian patent

An ambient temperature electric cell of primary and secondary nature, characterized by the use of a dithionite radical of an alkaline metal as the charge transfer agent and, including processes for manufacturing and for operating the same. The dithionite is dissolved in an anhydrous electrolyte comprised of a suitable solvent, which may also contain a salt of the same alkaline metal and be saturated with sulfur dioxide. A sealed and evacuated cell (negative electrode inert highly, porous space, and positive current gathering electrode) is filled with the electrolyte and subjected to a charging current sufficient to plate the alkaline metal onto the negative electrode while further …

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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

  • Granted December 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 12, 1980
GrantedDecember 22, 1981
Term endedDecember 22, 1998
Patent numberCA 1114894 A
Classification (IPC)H01M6/16 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Application filedAug 12, 1980Patent grantedDec 22, 1981Term endedDec 22, 1998

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.