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Expired Canadian patentCanada

High current density cell

CA 1259275 A · Owner: Olin Corporation · Inventors: Woodard, Kenneth E. Jr.; Justice, David D.; Hilliard, Garland E.

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A filter press membrane electrolytic cell having at least one cathode and one anode sandwiched about a permselective ion exchange membrane which employs a cathode having a first layer and a second layer cooperative with the membrane such that the voltage cofficient during operation at current densities greater than 4.0 kiloamperes per square meter is less than about 0.20 volts per kiloampere per square meter.

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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 September 12, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 12, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 11, 1985
GrantedSeptember 12, 1989
Term endedSeptember 12, 2006
Patent numberCA 1259275 A
Classification (IPC)C25B15/00 +2 more

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedJune 11, 1985Patent grantedSep 12, 1989Term endedSep 12, 2006

Sources & verification

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