Processes for the preparation of oxo-oxazoline or alloamino acid derivatives
CA 2383300 C · Owner: Shionogi & Co. Ltd. · Inventors: Koike, Haruo; Nagai, Masahiko; Kobayashi, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing a compound represented by the general formula (I-A) or the general formula (I-B) comprising the following step:, (see above step A) or (see above step B) wherein R1 is an optionally substituted lower alkyl and the , like; R2 is a lower alkyl or an optionally substituted aralkyl and the like; R3 is a lower alkyl, characterized in that a compound represented by the general formula (II-A) or the general formula(II-B) is treated with thionyl chloride.
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 25, 2000 and granted January 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2022.
- 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.