Patent Yard Sign in
Expired European patentEurope

Dynamic random access memory having bit lines buried in semiconductor substrate

EP 0444615 B1 · Applicant: KABUSHIKI KAISHA TOSHIBA

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed February 26, 1991 and granted April 17, 1996. A European patent lasts at most 20 years from filing, so its term ended February 26, 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 August 26, 2016.
  • 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.
FiledFebruary 26, 1991
PublishedSeptember 4, 1991
GrantedApril 17, 1996
Term endedFebruary 26, 2011
Application numberEP 91102827
Classification (CPC)H10B12/31

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 26, 1991PublishedSep 4, 1991Patent grantedApril 17, 1996Term endedFeb 26, 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.