Furan derivatives
CA 2023311 C · Owner: Kyowa Hakko Kogyo Co. Ltd. · Inventors: Shuto, Katsuichi; Kato, Hiromasa; Ichikawa, Shunji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A furan derivative of formula (I) and a pharmaceutically acceptable salt thereof having gastrointestinal enterokinetic activity which is expected to be used in a broad spectrum of diseases associated with gastrointestinal dyskinesia, (see formula I) wherein X is hydrogen or R1CH2- where R1 is lower alkoxy or R2R3N-, where R2 and R3 are the same or different and each is hydrogen or lower alkyl, or R2 and R3 taken, together with the adjacent nitrogen atom represent a, heterocyclic group of the formula (see formula II)
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 August 15, 1990 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 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.