Pyranones, methods of preparing and using them
CA 2310244 A1 · Owner: Dr. Willmar Schwabe Gmbh & Co. · Inventors: Chatterjee, Shyam Sunder; Hauer, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel 2H-1-pyran-2-ones of general formula (I) wherein R1 represents an alkyl radical with 2-5 C atoms a cycloalkyl radical , with 4-6 C atoms a cycloalkyl radical with 4-8 C atoms or an alkoxy alkyl radical with a total of 3-5 C atoms and R2 represents a 2-(3 4- methylene , dioxyphenyl)ethyl radical or a 2-phenyl ethenyl radical substituted with R3 R4 and R5 in positions 3, 4 and 5, whereby independently from each other R3 and R5 represent methoxy or ethoxy and R4 is a straight chain or branched alkoxy radical with 1-5 C atoms, an alkenyl radical with 3-5 C atoms a , cycloalkoxy radical with 4-6 C atoms a cycloalkyl radical with 4-8 C atoms or an alkoxy alkoxy …
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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 November 12, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2020.
- 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.