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Expired European patentEurope

A process for the preparation of an olefinically unsaturated ether

EP 0025240 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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.

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Why it's free to use

  • Filed August 14, 1980 and granted June 15, 1983. A European patent lasts at most 20 years from filing, so its term ended August 14, 2000.
  • 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 February 14, 2006.
  • 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.
FiledAugust 14, 1980
PublishedMarch 18, 1981
GrantedJune 15, 1983
Term endedAugust 14, 2000
Application numberEP 80200768
Classification (CPC)C07C41/06

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 14, 1980PublishedMarch 18, 1981Patent grantedJune 15, 1983Term endedAug 14, 2000

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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