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Expired European patentEurope

dRAM cell and method

EP 0187237 B1 · Applicant: TEXAS INSTRUMENTS INCORPORATED

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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 November 22, 1985 and granted March 25, 1992. A European patent lasts at most 20 years from filing, so its term ended November 22, 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 May 22, 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.
FiledNovember 22, 1985
PublishedJuly 16, 1986
GrantedMarch 25, 1992
Term endedNovember 22, 2005
Application numberEP 85114821
Classification (CPC)H10B12/395 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedNov 22, 1985PublishedJuly 16, 1986Patent grantedMarch 25, 1992Term endedNov 22, 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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