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Expired European patentEurope

Overwrite-capable magnetooptical recording medium allowing enlarged margin of high level beam intensity

EP 0475446 B1 · Applicant: NIKON CORPORATION

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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 September 13, 1991 and granted May 29, 1996. A European patent lasts at most 20 years from filing, so its term ended September 13, 2011.
  • 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 March 13, 2017.
  • 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.
FiledSeptember 13, 1991
PublishedMarch 18, 1992
GrantedMay 29, 1996
Term endedSeptember 13, 2011
Application numberEP 91115591
Classification (CPC)G11B11/10586

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 13, 1991PublishedMarch 18, 1992Patent grantedMay 29, 1996Term endedSep 13, 2011

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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