Pteridine derivatives, method for the production thereof, and use thereof
CA 2511238 A1 · Owner: Merz, Karl-Heinz · Inventors: Eisenbrand, Gerhard; Merz, Karl-Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to compounds of general formula (I) in which R1 , represents a piperazino, p-phenylendiamine 2,5-diazabicyclo-2.2.1-heptane, 2,5-diazabicyclo-2.2.2-octane or 3,8-diazabicyclo-3.2.1-octane residue each , of which can be substituted with at least one substituent R2, R4, which are , identical, represent a pyrrolidino thiazolidine, oxazolidine, or , imidazolidine residue each of which can be substituted with at least one substituent, R3 represents an alkyl, alkoxy alkylmercapto, or alkylamino , residue each of which can be substituted with at least one substituent and , the acid addition salts thereof. Said pteridine derivatives are suitable as phosphodiesterase …
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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 January 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2025.
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Timeline
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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.