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Expired European patentEurope

Process for producing beta-hydroxy-gamma-butyrolactone derivatives and beta-(meth)acryloyloxy-gamma-butyrolactone derivatives

EP 1052258 B1 · Applicant: Mitsubishi Rayon Co., Ltd.

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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.

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Why it's free to use

  • Filed December 24, 1998 and granted March 3, 2004. A European patent lasts at most 20 years from filing, so its term ended December 24, 2018.
  • 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 June 24, 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.
FiledDecember 24, 1998
PublishedNovember 15, 2000
GrantedMarch 3, 2004
Term endedDecember 24, 2018
Application numberEP 98961502
Classification (CPC)C07D307/33

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedDec 24, 1998PublishedNov 15, 2000Patent grantedMarch 3, 2004Term endedDec 24, 2018

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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