Phthalazine derivatives having phosphodiesterase inhibitory and cardiac stimulating properties
CA 1111850 A · Owner: Pfizer Corporation · Inventors: Ham, Allan L.; Evans, Anthony G.; Danilewicz, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phthalazine derivatives having phosphodiesterase inhibitory and cardiac stimulating properties are described. The new compounds have the formula:, wherein R1 is hydrogen or lower alkyl; (R2)n represents 1 to 3 substituents each R2 being hydroxy or lower alkyl and n being 1 to 3 or any two moieties, R2 constitute a methylenedioxy or ethylenedioxy group attached to adjacent positions of the benzene ring; and Y is attached to the 3- or 4-position of the piperidino ring and represents either (a) a group of the formula -Z1-COR3 wherein Z1 is -CH2- or -N(R4)-, -COR3 is any of various defined acyl radicals and R4 is hydrogen or any of various defined substituents; or (b) a group of the fonmula …
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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
- Granted November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.