2-azetidinone derivatives
CA 2000437 A1 · Owner: Hatayama, Katsuo · Inventors: Sato, Masakazu; Kawashima, Yutaka; Watanabe, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 2-azetizinone derivative represented by the formula:, wherein R1 is a halogen atom an alkyl group having 1 to, 4 carbon atoms an alkoxy group having 1 to 4 carbon, atoms or an alkoxycarbonyl group in which the alkoxy group has 1 to 4 carbon atoms, R2 is a group represented by the formula, , , or, , a pyrrolidinyl group or a tetrahydroazepinyl group and, n is an integer of from 2 to 10, and a salt thereof are disclosed. These compounds are useful as blood platelet aggregation inhibiting agent.
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 October 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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.