Epoxysuccinamide derivatives or salts thereof, and drugs containing the same
CA 2211128 C · Owner: Asao, Tetsuji · Inventors: Yamashita, Tomohiro; Katunuma, Nobuhiko; Tada, Yukio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates an epoxysuccinamide derivative represented by the general formula (1) (see formula I), wherein R1 and R2 are the same or different from each other and independently represent H or an aromatic hydrocarbon group or aralkyl group which may be substituted or R1 and, R2 may form a nitrogen-containing heterocyclic ring together with the adjacent nitrogen atoms R3 is H or an, acyl group, R4 is H or an aralkyl group and R5 is an, aromatic hydrocarbon group or aralkyl group which may be substituted, or R5 may form an amino acid residue which, may be protected, together with the adjacent nitrogen atom or a salt thereof, and a medicine comprising the derivative as an active …
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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 December 10, 1996 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2018.
- 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.