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Method and apparatus for writing a signal-information track by using a radiation beam

EP 0048041 A2 · Applicant: DISCOVISION ASSOCIATES

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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 27, 1979 and never granted as a European patent. Had it been granted, its 20-year term would have ended March 27, 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 27, 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 27, 1979
PublishedMarch 24, 1982
GrantedNever granted
Term endedMarch 27, 1999
Application numberEP 81200915
Classification (CPC)G11B7/12 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMarch 27, 1979PublishedMarch 24, 1982Term endedMarch 27, 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

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