Expired Canadian patentCanada
Process for oxidizing hydrogen sulfide contained in mineral acid
CA 1305848 C · Owner: Hoechst Aktiengesellschaft · Inventors: Schrodter, Klaus; Kolkmann, Friedrich
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydrogen sulfide contained in mineral acid is oxidized. To this end, a vanadium content of at least 10 ppm is established in the mineral acid prior to adding hydrogen peroxide.
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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 August 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 7, 1987
GrantedAugust 4, 1992
Term endedAugust 4, 2009
Patent numberCA 1305848 C
Classification (IPC)C01B17/16 +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.