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Expired European patentEurope

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EP 0004661 B1 · Applicant: DÜRKOPPWERKE GMBH

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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 March 31, 1979 and granted April 8, 1981. A European patent lasts at most 20 years from filing, so its term ended March 31, 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 October 1, 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 31, 1979
PublishedOctober 17, 1979
GrantedApril 8, 1981
Term endedMarch 31, 1999
Application numberEP 79101004
Classification (CPC)B65H75/28 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMarch 31, 1979PublishedOct 17, 1979Patent grantedApril 8, 1981Term endedMarch 31, 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.