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Expired Canadian patentCanada

Process for preparing amorphous sodium aluminosilicate base exchange materials

CA 1099485 A · Owner: Huber (J.M.) Corporation · Inventors: Mays, Robert K.; Williams, Lloyd E.

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Abstract From the Canadian patent

A method for producing certain novel finely divided amorphous, precipitated alkali metal alumino silicates having increased ion exchange properties is disclosed. The products of the invention are produced by commingling and precipitating under certain controlled conditions, dilute aqueous solutions of an alkali metal silicate and alkali metal aluminate. Significant process variables include the chemical composition and concentration of the reactants, the precipitating temperatures, and pH, the sequence and rate of the addition of the reactants and the mixing intensity during the precipitation. The amorphous products of the invention have base or ion exchange capacities equal and/or superior …

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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 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 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.
FiledNovember 5, 1975
GrantedApril 21, 1981
Term endedApril 21, 1998
Patent numberCA 1099485 A
Classification (IPC)C01B33/22 +2 more

Timeline

Timeline From CIPO dates

19761979198219851988199119941997Application filedNov 5, 1975Patent grantedApril 21, 1981Term endedApril 21, 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.