Expired Canadian patentCanada
Recovery of metals and metal compounds soluble in ammoniacal liquors
CA 296177 A · Owner: I. G. Farbenindustrie Aktiengesellschaft · Inventors: Franz Duftschmid; Leo Schlecht; Walter Schubardt
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 December 31, 1929. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 1946.
- 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—
GrantedDecember 31, 1929
Term endedDecember 31, 1946
Patent numberCA 296177 A
Classification (IPC)C22B3/04
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.