3-aryl-pyrone derivatives
CA 2105614 A1 · Owner: Erdelen, Christoph · Inventors: Erdelen, Christoph; Ruther, Michael; Schmidt, Robert R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-Aryl-pyrone derivatives, A B S T R A C T The invention relates to 3-aryl-pyrone derivatives of the general formula (I), (I), in which, A represents hydrogen halogen, optionally substituted, radicals from the series comprising alkyl cyclo-, alkyl, alkenyl, alkinyl, arylalkyl aryl, hetaryl-, alkyl and hetaryl, or represents the groups -COR1 -CO2R1, -CN, -CONR1R2, -SO2R1 and -P(O)(OR1)(OR2) in, which, R1 and R2 independently of one another represent hydrogen or optionally substituted radicals from the series comprising alkyl, alkenyl arylalkyl, aryl, hetarylalkyl and hetaryl or R1 and R2 together represent an optionally substituted alkylene group which can be interrupted by one or more …
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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
- Filed September 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 7, 2015.
- 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.