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Expired European patentEurope

Process for the preparation of alkanediols

EP 0337572 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 April 10, 1989 and granted January 20, 1993. A European patent lasts at most 20 years from filing, so its term ended April 10, 2009.
  • 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 October 10, 2014.
  • 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.
FiledApril 10, 1989
PublishedOctober 18, 1989
GrantedJanuary 20, 1993
Term endedApril 10, 2009
Application numberEP 89200901
Classification (CPC)C07C29/172

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 10, 1989PublishedOct 18, 1989Patent grantedJan 20, 1993Term endedApril 10, 2009

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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