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Expired European patentEurope

Semiconductor memory device and method of manufacturing the same

EP 0164829 B1 · Applicant: NIPPON TELEGRAPH AND TELEPHONE 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, 1985 and granted September 28, 1988. A European patent lasts at most 20 years from filing, so its term ended March 26, 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 September 26, 2010.
  • 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, 1985
PublishedDecember 18, 1985
GrantedSeptember 28, 1988
Term endedMarch 26, 2005
Application numberEP 85302116
Classification (CPC)H10B12/373 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMarch 26, 1985PublishedDec 18, 1985Patent grantedSep 28, 1988Term endedMarch 26, 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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