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Expired European patentEurope

Process for preparing 2,6-ditertiarybutyl-4-mercaptophenol and 4,4'-isopropylidenedithiobis-(2,6-di-tertiarybutylphenol)

EP 0275952 B1 · Applicant: MERRELL DOW PHARMACEUTICALS INC.

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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 January 18, 1988 and granted July 24, 1991. A European patent lasts at most 20 years from filing, so its term ended January 18, 2008.
  • 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 July 18, 2013.
  • 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.
FiledJanuary 18, 1988
PublishedJuly 27, 1988
GrantedJuly 24, 1991
Term endedJanuary 18, 2008
Application numberEP 88100607
Classification (CPC)C07C323/00

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJan 18, 1988PublishedJuly 27, 1988Patent grantedJuly 24, 1991Term endedJan 18, 2008

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.