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European application, no grantEurope

Process for preparing carboxylic anhydrides

EP 0004641 A2 · Applicant: BAYER AG

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 March 29, 1979 and never granted as a European patent. Had it been granted, its 20-year term would have ended March 29, 1999.
  • 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 September 29, 2004.
  • 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.
FiledMarch 29, 1979
PublishedOctober 17, 1979
GrantedNever granted
Term endedMarch 29, 1999
Application numberEP 79100942
Classification (CPC)C07C51/567 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMarch 29, 1979PublishedOct 17, 1979Term endedMarch 29, 1999

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.