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Expired Canadian patentCanada

Bipolar electrolyzer having silicon laminate backplate

CA 1069081 A · Owner: Ppg Industries, Inc. · Inventors: Carlson, Gordon A.; Hoekje, Howard H.; Simmons, Robert B.

CIPO record

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Abstract From the Canadian patent

Disclosed is a bipolar electrolyzer having a plurality of bipolar units spaced from and parallel to each other with a pair of bipolar units defining a single electrolytic cell therebetween. Each of the bipolar units has an anode on one surface and a cathode on the opposite surface so that, the cathode of one bipolar unit faces the anode of the next adjacent bipolar unit. A steel plate is one exposed surface of the backplate and a silicon sheet in electrical contact with the steel plate is the opposite exposed surface of the backplate. The steel plate and the silicon sheet are bonded together with a suitable electroconductive bonding material.

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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 January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
  • 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—
GrantedJanuary 1, 1980
Term endedJanuary 1, 1997
Patent numberCA 1069081 A
Classification (IPC)C25B9/00 +2 more

Sources & verification

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