Phellodendrine analogs and allergy type iv suppressor containing the same as active ingredient
CA 2103367 A1 · Owner: Kawamura, Hideki · Inventors: Kawamura, Hideki; Nishioka, Itsuo; Fujisawa, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phellodendrine analogs represented by the following formula (I), (I), wherein A represents a group wherein B represents a hydrogen atom, a lower alkyl group, or a lower acyl group, or A and B may form together with the adjacent nitrogen atom a substituted, 1,2,3,4-tetrahydroisoquinolyl ring represented by the following formula, , wherein R11, R12, R21 R22, R31 and R32 individually, represent a hydrogen atom a hydroxy group, or a lower, alkoxy group n1 is a number 0-2, n2 is 1 or 2, and m1 denotes a number 0-1, provided that when A is a group , 162, if n2 is 2, B is a lower acyl group and further that, when A and B together form a substituted 1,2,3,4tetrahydroisoquinolyl ring, n1 is 1 and …
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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 May 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2014.
- 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.