Quinoline or quinazoline derivatives, their production and use
CA 2114300 C · Owner: Takeda Chemical Industries, Ltd. · Inventors: Baba, Atsuo; Makino, Haruhiko; Sohda, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound represented by the general formula: wherein Y represents a nitrogen atom or C-G (G represents a carboxyl group which may be esterified); ring R is a nitrogen-containing unsaturated heterocyclic group which may be substituted for; each of rings A and B may have, a substituent; n represents an integer from 1 to 4; k represents the integer 0 or 1, or a salt thereof, which serves well as an anti-inflammatory agent particularly a, therapeutic agent for arthritis.
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 January 26, 1994 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2016.
- 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.