Expired Canadian patentCanada
Preparation of derivatives of bismethyl-aminotetraminoarsenobenzene
CA 203159 A · Owner: C. F. Beohringer And Soehne · Inventors: Lorenz Ach
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 August 17, 1920. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 17, 1937.
- 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—
GrantedAugust 17, 1920
Term endedAugust 17, 1937
Patent numberCA 203159 A
Classification (IPC)C07C
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.