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Expired European patentEurope

A method of producing a 2,4'-dihydroxydiphenylsulfone

EP 0627415 B1 · Applicant: NICCA CHEMICAL CO., LTD.

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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 December 11, 1993 and granted September 10, 1997. A European patent lasts at most 20 years from filing, so its term ended December 11, 2013.
  • 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 June 11, 2019.
  • 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.
FiledDecember 11, 1993
PublishedDecember 7, 1994
GrantedSeptember 10, 1997
Term endedDecember 11, 2013
Application numberEP 93120018
Classification (CPC)C07C315/00

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedDec 11, 1993PublishedDec 7, 1994Patent grantedSep 10, 1997Term endedDec 11, 2013

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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