Expired Canadian patentCanada
Polymer-treated ion exchange resins
CA 1283497 C · Owner: Fisons Corporation · Inventors: Raghunathan, Yegnaswami; Chow, San-Laung
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sulfonic acid cationic exchange resin particles which have been treated to improve their coatability with minor amounts of high molecular weight polymers selected from carboxypolymethylene, xanthan gum, and propylene glycol alginate.
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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 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 27, 1987
GrantedApril 23, 1991
Term endedApril 23, 2008
Patent numberCA 1283497 C
Classification (IPC)B01J39/18 +1 more
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.