Carbonic acid esters, and the preparation thereof and their use
CA 1058198 A · Owner: Fujisawa Pharmaceutical Co. · Inventors: Itoh, Masumi; Kamiya, Takashi; Hagiwara, Daijiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and novel carbonic acid ester for the protection of amino and ?mino groups in amino and imino group - containing compounds is provided; the process comprises reacting an amino or imino group - containing compound with a crabonic acid ester of the formula:, F1OCOOR2, wherein R1 is a lower alkyl which may have one or more substituents selected from the group of halogen, lower alkoxy and aryloxy or ar(lower)-alkyl which may be unsubstituted or substituted with a substituant selected from the group of lower alkoxy ha??gen nitro and cyano, and, R2 is a group represented by the formula: wherein Y is aryl which may have substitutent(s) selected from the group of halogen, lower alkoxy, …
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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
- Granted July 10, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 10, 1996.
- 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
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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.