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Expired European patentEurope

Process for the separation of sulphuric acid from aqueous mixtures thereof with paraffinsulphonic acids

EP 0274161 B1 · Applicant: ENIRICERCHE S.p.A.

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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 18, 1987 and granted May 2, 1990. A European patent lasts at most 20 years from filing, so its term ended December 18, 2007.
  • 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 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.
FiledDecember 18, 1987
PublishedJuly 13, 1988
GrantedMay 2, 1990
Term endedDecember 18, 2007
Application numberEP 87202570
Classification (CPC)C07C303/44

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 18, 1987PublishedJuly 13, 1988Patent grantedMay 2, 1990Term endedDec 18, 2007

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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