Substituded 3-(1-aminoethylidene)-5-cinnamoyl-2h-pyran-2,6-(3h)-diones
CA 1064510 A · Owner: Smith Kline And French Canada Ltd. · Inventors: Willis, Chester R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted 3-(1-aminoethylidene)-5-cinnamoyl-2Hpyran-2,6(3H)-diones useful as inhibitors of certain antigenantibody reactions, particularly in alleviating allergic manifestations such as asthma, are prepared by reaction of a 3-(1-aminoethylidene)-5-acetyl-2H-pyran-2,6(3H)-dione derivative with an appropriately substituted benzaldehyde.
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 October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 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.