Expired European patentEurope
Process for producing optically active threo-3-amino-1,2-epoxy compounds
EP 1052257 B1 · Applicant: Nippon Kayaku Kabushiki Kaisha
Overview
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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 13, 1999 and granted March 31, 2004. A European patent lasts at most 20 years from filing, so its term ended January 13, 2019.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by July 13, 2024.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJanuary 13, 1999
PublishedNovember 15, 2000
GrantedMarch 31, 2004
Term endedJanuary 13, 2019
Application numberEP 99900302
Classification (CPC)C07D303/36 +1 more
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.