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Expired European patentEurope

Writable distributed non-volatile analog reference system and method for analog signal recording and playback

EP 0551381 B1 · Applicant: INFORMATION STORAGE DEVICES, INC.

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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 September 23, 1991 and granted April 14, 1999. A European patent lasts at most 20 years from filing, so its term ended September 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 March 23, 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 23, 1991
PublishedJuly 21, 1993
GrantedApril 14, 1999
Term endedSeptember 23, 2011
Application numberEP 91918172
Classification (CPC)G11C7/16 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 23, 1991PublishedJuly 21, 1993Patent grantedApril 14, 1999Term endedSep 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.