Patent Yard Sign in
Expired European patentEurope

Method of producing optically active 1,2,4-butanetriol

EP 0879893 B1 · Applicant: DAICEL CHEMICAL INDUSTRIES, Ltd.

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed May 14, 1998 and granted September 26, 2001. A European patent lasts at most 20 years from filing, so its term ended May 14, 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 November 14, 2023.
  • 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.
FiledMay 14, 1998
PublishedNovember 25, 1998
GrantedSeptember 26, 2001
Term endedMay 14, 2018
Application numberEP 98108799
Classification (CPC)C12P41/00 +1 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMay 14, 1998PublishedNov 25, 1998Patent grantedSep 26, 2001Term endedMay 14, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.