Xanthine derivatives
CA 2091553 A1 · Owner: Mizumoto, Hideaki · Inventors: Karasawa, Akira; Suzuki, Fumio; Nonaka, Hiromi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
29, Abstract of the Disclosure, A xanthine derivative of the formula (I): (I), wherein R1 and R2 are the same or different and are substituted or unsubstituted alicyclic alkyl; m1 and m2 are the same or different and represent an integer of 0 to 2; and Q represents, (in which R3 and R4 are the same or different and are substituted or unsubstituted alicyclic alkyl) or (in which n is 0 or 1, and Y is a single bond or alkylene); or a pharmaceutically acceptable salt thereof is disclosed. This derivative has diuretic activity and renal protecting activity.
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 March 11, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 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.