Tetrazole derivatives and drugs
CA 2086117 A1 · Owner: Yasufuku, Shoji · Inventors: Yasufuku, Shoji; Inoue, Kichiro; Yoshimoto, Yoshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invent1on relates to a compound of the following general formula I or a pharmacologically acceptable salt thereof. I , wherein A means -(O)m-(CH(R4))n- (R4 is hydrogen or alkyl; m and n each is 0 or 1); B means oxygen or -S(O)p- (p is 0 to 2) ; R' means, hydrogen lower alkyl, lower alkoxy, halogen, haloalkyl or hydroxy; R2 means alkyl, alkenyl or aralkyl which, may be substituted or unsubstituted; R9 means hydrogen lower alkoxy or halogen; R9 means hydrogen lower, alkyl, lower alkoxy, lower acyloxy halogen, nitro or, hydroxy; R10 means hydrogen or lower alkyl. This compound has antiallergy and antiinflammatory activities and is of use as a therapeutic agent for bronchial asthma, …
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 June 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 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.