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Expired European patentEurope

Maleic anhydride production with high butane feed concentration

EP 0112323 B1 · Applicant: MONSANTO COMPANY

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Overview

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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 19, 1983 and granted July 12, 1989. A European patent lasts at most 20 years from filing, so its term ended December 19, 2003.
  • 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 19, 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.
FiledDecember 19, 1983
PublishedJune 27, 1984
GrantedJuly 12, 1989
Term endedDecember 19, 2003
Application numberEP 83870133
Classification (CPC)C07C51/215

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 19, 1983PublishedJune 27, 1984Patent grantedJuly 12, 1989Term endedDec 19, 2003

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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