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Expired European patentEurope

Method of writing information on a magnetic-recording carrier

EP 0010494 B1 · Applicant: COMPAGNIE INTERNATIONALE POUR L'INFORMATIQUE CII - HONEYWELL BULL (dite CII-HB)

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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 October 15, 1979 and granted April 18, 1984. A European patent lasts at most 20 years from filing, so its term ended October 15, 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 April 15, 2005.
  • 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.
FiledOctober 15, 1979
PublishedApril 30, 1980
GrantedApril 18, 1984
Term endedOctober 15, 1999
Application numberEP 79400748
Classification (CPC)G11B27/105 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedOct 15, 1979PublishedApril 30, 1980Patent grantedApril 18, 1984Term endedOct 15, 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.