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Expired European patentEurope

Semiconductor memory circuit

EP 0508652 B1 · Applicant: NEC 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 March 26, 1992 and granted July 30, 1997. A European patent lasts at most 20 years from filing, so its term ended March 26, 2012.
  • 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 26, 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.
FiledMarch 26, 1992
PublishedOctober 14, 1992
GrantedJuly 30, 1997
Term endedMarch 26, 2012
Application numberEP 92302663
Classification (CPC)G11C8/10

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 26, 1992PublishedOct 14, 1992Patent grantedJuly 30, 1997Term endedMarch 26, 2012

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.