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Expired European patentEurope

Preparation of secondary thiols

EP 0122654 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 March 23, 1984 and granted December 10, 1986. A European patent lasts at most 20 years from filing, so its term ended March 23, 2004.
  • 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 September 23, 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.
FiledMarch 23, 1984
PublishedOctober 24, 1984
GrantedDecember 10, 1986
Term endedMarch 23, 2004
Application numberEP 84200420
Classification (CPC)C07C321/00

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 23, 1984PublishedOct 24, 1984Patent grantedDec 10, 1986Term endedMarch 23, 2004

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

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