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Expired European patentEurope

Process for the carbonylation of formaldehyde acetals

EP 0071920 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 31, 1982 and granted July 11, 1984. A European patent lasts at most 20 years from filing, so its term ended July 31, 2002.
  • 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 31, 2008.
  • 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 31, 1982
PublishedFebruary 16, 1983
GrantedJuly 11, 1984
Term endedJuly 31, 2002
Application numberEP 82106931
Classification (CPC)C07C67/37

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedJuly 31, 1982PublishedFeb 16, 1983Patent grantedJuly 11, 1984Term endedJuly 31, 2002

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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