Diamine compounds and cerebral protective drugs containing the same
CA 2087604 C · Owner: Sato, Seiichi · Inventors: Sato, Seiichi; Kawamura, Kiyoshi; Ohta, Tomio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a diamine compound of formula (I) or an acid addition salt thereof: wherein R1, R2, R3, R4, R5 and R6 are the same or different from each other and represent individually a hydrogen atom, halogen atom, hydroxyl group lower alkyl, group, lower alkoxy group lower acyloxy group, lower, alkoxycarbonyloxy group lower alkylsulfonyloxy group or, am amino group among which the lower alkyl group and, lower alkoxy group may be substituted by a halogen atom or a phenyl group; R7 and R8 are the same or different from each other and represent individually a lower alkyl group or the two bind to each other to represent an alkylene group having 1 to 4 carbon atoms; A and A' …
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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 July 30, 1990 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2012.
- 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.