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Expired European patentEurope

Field effect transistor circuit

EP 0448047 B1 · Applicant: KABUSHIKI KAISHA TOSHIBA

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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 March 19, 1991 and granted February 1, 1995. A European patent lasts at most 20 years from filing, so its term ended March 19, 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 September 19, 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.
FiledMarch 19, 1991
PublishedSeptember 25, 1991
GrantedFebruary 1, 1995
Term endedMarch 19, 2011
Application numberEP 91104246
Classification (CPC)H03K19/01707

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 19, 1991PublishedSep 25, 1991Patent grantedFeb 1, 1995Term endedMarch 19, 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.