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Expired European patentEurope

Semiconductor memory having high speed and low power data read/write circuit

EP 0658902 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.

Why it's free to use

  • Filed December 15, 1994 and granted March 8, 2000. A European patent lasts at most 20 years from filing, so its term ended December 15, 2014.
  • 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 June 15, 2020.
  • 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.
FiledDecember 15, 1994
PublishedJune 21, 1995
GrantedMarch 8, 2000
Term endedDecember 15, 2014
Application numberEP 94119890
Classification (CPC)G11C7/1048 +1 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedDec 15, 1994PublishedJune 21, 1995Patent grantedMarch 8, 2000Term endedDec 15, 2014

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