Process for preparing carboxamides of oxo-1,2-benzothiazine-1,1-dioxides
CA 1052376 A · Owner: Pfizer Inc. · Inventors: Lombardino, Joseph G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for the production of benzothiazine dioxides which have been found to be baluable antiinflammatory agents that do not produce the undesirable side-effects frequently experienced with cortico-steroids. In particular it, relates to an improved chemical process for the production of Nsubstituted-3,4-dihydro-2-substituted-4-oxo-2H-1,2-benzothiazine- 3-carboxamide-1,1-dioxides and N-substituted 3,4-dihydro-2-substituted-3-oxo-2H-1,2-benzothiazine-4-carboxamide-1,1-dioxide wherein the N-substituent is a heterocyclic moiety.
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 10, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 1996.
- 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.