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Expired Canadian patentCanada

Caustic alkali producing multiple vertical diaphragm type electrolytic cell admitting of easy assembly

CA 1053176 A · Owner: Kureha Kagaku Kogyo Kabushiki Kaisha · Inventors: Okazaki, Isao; Kokubu, Yoshikazu; Shikano, Haruo

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

In a caustic alkali producing multiple vertical diaphragm type electrolytic cell, wherein a plurality of vertical flat box shaped unit anode chamber sets are assembled in parallel in a cathodic cell case having a conductive base each said, unit anode chamber set comprising main walls formed of a pair of diaphragms and a pair of cathode wire nets stretched on a frame on the outside of said diaphragms and a pair of anode, plates received in said anode chamber so as to face said diaphragms, the improvement characterized in that when the plural, unit anode chamber sets are assembled in parallel in the cell case, the cathode wire nets can be electrically connected easily to the conductive base …

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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 April 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 24, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedApril 24, 1979
Term endedApril 24, 1996
Patent numberCA 1053176 A
Classification (IPC)C25B9/00 +1 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedApril 24, 1979Term endedApril 24, 1996

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