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Expired European patentEurope

System for optical recording of data on disks and corresponding methods of reading and writing

EP 0455539 B1 · Applicant: THOMSON-CSF

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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 April 23, 1991 and granted January 10, 1996. A European patent lasts at most 20 years from filing, so its term ended April 23, 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 October 23, 2016.
  • 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.
FiledApril 23, 1991
PublishedNovember 6, 1991
GrantedJanuary 10, 1996
Term endedApril 23, 2011
Application numberEP 91401073
Classification (CPC)G11B7/0065

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 23, 1991PublishedNov 6, 1991Patent grantedJan 10, 1996Term endedApril 23, 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

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