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Expired European patentEurope

Process for producing acetic anhydride

EP 0101581 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 July 30, 1983 and granted June 12, 1985. A European patent lasts at most 20 years from filing, so its term ended July 30, 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 January 30, 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.
FiledJuly 30, 1983
PublishedFebruary 29, 1984
GrantedJune 12, 1985
Term endedJuly 30, 2003
Application numberEP 83107535
Classification (CPC)C07C51/56

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJuly 30, 1983PublishedFeb 29, 1984Patent grantedJune 12, 1985Term endedJuly 30, 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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