Novel polymorphic forms of cipamfylline
CA 2306980 A1 · Owner: Smithkline Beecham Corporation · Inventors: Eggleston, Drake; Lynch, Ian Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel crystalline polymorphic forms Form I, II and , IV of Cipamfylline, methods of preparation and use thereof in the treatment , of PDE4 and TNF mediated diseases. Cipamfylline is 1,3-di-cyclopropylmethyl-8amino xanthine, and represented by formula (I).
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 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2020.
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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.