Purification of alkanesulfonyl chlorides
CA 1328889 C · Owner: Wheaton, Gregory Alan · Inventors: Nosowitz, Martin; Gardner, David Milton; Wheaton, Gregory Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing odorous and color-forming impurities from alkanesulfonyl chlorides comprising contacting said alkanesulfonyl chlorides with an ozone-containing gas at a temperature ranging from about 0°C to about 100°C for a time sufficient to reduce odorous and color-forming impurities therein.
Read 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 April 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.