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Expired European patentEurope

Manufacturing method of semiconductor memory device

EP 0499985 B1 · Applicant: KABUSHIKI KAISHA TOSHIBA

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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 February 14, 1992 and granted June 2, 1999. A European patent lasts at most 20 years from filing, so its term ended February 14, 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 August 14, 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.
FiledFebruary 14, 1992
PublishedAugust 26, 1992
GrantedJune 2, 1999
Term endedFebruary 14, 2012
Application numberEP 92102522
Classification (CPC)H10B41/30

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedFeb 14, 1992PublishedAug 26, 1992Patent grantedJune 2, 1999Term endedFeb 14, 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

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