4-phenylphthalazine derivatives
CA 2039258 A1 · Owner: Kanayama, Toshiji · Inventors: Kanayama, Toshiji; Iwase, Norimichi; Morinaka, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
38-, Abstract of the Disclosure:, 4-Phenylphthalazine derivatives of the formula: wherein R1 is an alkyl or hydroxyalkyl group of 1-5 carbon atoms; R2 is a hydrogen atom or an alkyl group of 1 5 carbon atoms; or R1 and R2, when taken together may represent an, alkylene group of 2-6 carbon atoms said group optionally, containing one or more oxygen atoms; R3 and R4 are independently a hydrogen or halogen atom an alkyl or alkoxy, group of 1-4 carbon atoms or when two of R3 are adjacently, positioned (R3)? may represent a -0-(CH2)p-0- group and/or when two of R4 are adjacently positioned (R4)m may, represent a -0-(CH2)p-0- group; R5 is a hydrogen or halogen atom, an alkyl or alkoxy group of 1-4 …
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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 March 27, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2013.
- 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.