Expired Canadian patentCanada
Process for the removal of gaseous impurities from exhaust gases of contact process plants producing sulfuric acid
CA 1019540 A · Owner: Sud-Chemie Aktiengesellschaft · Inventors: Dorr, Karl-Heinz; Grimm, Hugo; Sander, Ulrich
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 October 25, 1977. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 25, 1994.
- 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—
GrantedOctober 25, 1977
Term endedOctober 25, 1994
Patent numberCA 1019540 A
Classification (IPC)C01B17/74 +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.