Expired Canadian patentCanada
Process for the preparation of 1,2,-disulfone compounds
CA 1322202 C · Owner: Ciba-Geigy Ag · Inventors: Bartmann, Ekkehard
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of 1,2-disulfone compounds by oxidation of corresponding 1,2-disulfonylhydrazine compounds with the aid of concentfated nitric acid as the oxidizing agent.
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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 September 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 14, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 10, 1989
GrantedSeptember 14, 1993
Term endedSeptember 14, 2010
Patent numberCA 1322202 C
Classification (IPC)C07C315/00 +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.