Preparation of alkanesulfonamides
CA 2001876 A1 · Owner: Perilli, James S. · Inventors: Perilli, James S.; Sandler, Stanley R.; Kennoy, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the preparation of alkanesulfonamides in high purity and high yield using solvents selected from C4 to C8 cyclic ethers or mixtures thereof is disclosed. The final products have use as synthetic intermediates for the manufacture of useful final products.
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
- Filed October 31, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 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.