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Expired European patentEurope

Process of recovery of maleic anhydride from reaction gaseous mixtures

EP 0459543 B1 · Applicant: SISAS SOCIETA'ITALIANA SERIE ACETICA E SINTETICA SPA

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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 April 18, 1991 and granted March 15, 1995. A European patent lasts at most 20 years from filing, so its term ended April 18, 2011.
  • 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 October 18, 2016.
  • 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.
FiledApril 18, 1991
PublishedDecember 4, 1991
GrantedMarch 15, 1995
Term endedApril 18, 2011
Application numberEP 91200918
Classification (CPC)C07C51/573

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 18, 1991PublishedDec 4, 1991Patent grantedMarch 15, 1995Term endedApril 18, 2011

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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