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Expired European patentEurope

Semiconductor quantum effect device having negative differential resistance characteristics

EP 0363238 B1 · Applicant: FUJITSU LIMITED

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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 September 12, 1989 and granted July 26, 1995. A European patent lasts at most 20 years from filing, so its term ended September 12, 2009.
  • 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 March 12, 2015.
  • 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.
FiledSeptember 12, 1989
PublishedApril 11, 1990
GrantedJuly 26, 1995
Term endedSeptember 12, 2009
Application numberEP 89402492
Classification (CPC)H10D62/824 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedSep 12, 1989PublishedApril 11, 1990Patent grantedJuly 26, 1995Term endedSep 12, 2009

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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