Antidepressants
CA 2116967 C · Owner: Suzuki, Fumio · Inventors: Koike, Nobuaki; Nakamura, Joji; Ishii, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an antidepressant containing as an active ingredient a xanthine derivative or a pharmaceutically acceptable salt thereof the xanthine, derivative being represented by Formula (I): (see formula I), in which R1, R2, and R3 represent independently hydrogen lower alkyl, lower alkenyl, or lower alkynyl; R4 represents cycloalkyl, -(CH2)n-R5 (in which R5 represents substituted or unsubstituted aryl or a substituted or unsubstituted heterocyclic group; and n is an integer of 0 to 4), or, (see formula II), (in which Y1 and Y2 represent independently hydrogen halogen, or lower alkyl; and Z represents substituted or unsubstituted aryl, (see formula III) -180-, (in …
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 July 7, 1993 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2015.
- 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.