Expired Canadian patentCanada
Process for removing heavy metal ions from anhydrous strong organic acids
CA 893948 A · Owner: Farbwerke Hoechst Aktiengesellschaft Vormals Meister Lucius And Bruning · Inventors: Manfred Gscheidmeier; Walter Freyer
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead the whole patent
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 February 22, 1972. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 22, 1989.
- 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—
GrantedFebruary 22, 1972
Term endedFebruary 22, 1989
Patent numberCA 893948 A
Classification (IPC)B01J39/05 +2 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.