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Expired European patentEurope

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EP 0109697 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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Overview

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

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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 October 6, 1983 and granted May 14, 1986. A European patent lasts at most 20 years from filing, so its term ended October 6, 2003.
  • 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 April 6, 2009.
  • 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.
FiledOctober 6, 1983
PublishedMay 30, 1984
GrantedMay 14, 1986
Term endedOctober 6, 2003
Application numberEP 83201440
Classification (CPC)A01N25/004

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedOct 6, 1983PublishedMay 30, 1984Patent grantedMay 14, 1986Term endedOct 6, 2003

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