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Expired European patentEurope

Apparatus and method for recording and recovering a binary symbol sequence using an intermediate step of converting the binary sequence into a ternary sequence

EP 0180100 B1 · Applicant: International Business Machines Corporation

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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 October 17, 1985 and granted May 16, 1990. A European patent lasts at most 20 years from filing, so its term ended October 17, 2005.
  • 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 17, 2011.
  • 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 17, 1985
PublishedMay 7, 1986
GrantedMay 16, 1990
Term endedOctober 17, 2005
Application numberEP 85113175
Classification (CPC)G11B20/1492

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedOct 17, 1985PublishedMay 7, 1986Patent grantedMay 16, 1990Term endedOct 17, 2005

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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