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Expired Canadian patentCanada

Process for carrying out ion exchange reactions

CA 1085977 A · Owner: Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler · Inventors: Schreyer, Gerd; Prescher, Gunter; Heim, Wolfgang

CIPO record

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

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Abstract From the Canadian patent

The present invention provides a process for carrying out ion exchange in a cycle including loading and regenerating steps, the improvement in which at least the regeneration step the liquid streams draining from the resin during the charging of the regenerating agent and during washing after the charging of the regenerating agent which still contain regenerating agent which can be utilized are intercepted as a single fraction which, is homogeneous with respect to composition and density and, this solution is reused in the next regeneration being recycled on the resin, both this reused fraction and fresh regenerating agent being passed over the resin in a countercurrent to the loading step.

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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 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 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.
FiledOctober 1, 1976
GrantedSeptember 16, 1980
Term endedSeptember 16, 1997
Patent numberCA 1085977 A
Classification (IPC)B01J49/05 +2 more

Timeline

Timeline From CIPO dates

1977198019831986198919921995Application filedOct 1, 1976Patent grantedSep 16, 1980Term endedSep 16, 1997

Sources & verification

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