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Expired European patentEurope

Tri-state logic buffer circuit

EP 0023210 B1 · Applicant: Western Electric Company, Incorporated

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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 January 2, 1980 and granted March 30, 1983. A European patent lasts at most 20 years from filing, so its term ended January 2, 2000.
  • 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 July 2, 2005.
  • 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.
FiledJanuary 2, 1980
PublishedFebruary 4, 1981
GrantedMarch 30, 1983
Term endedJanuary 2, 2000
Application numberEP 80900215
Classification (CPC)H03K19/09429

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJan 2, 1980PublishedFeb 4, 1981Patent grantedMarch 30, 1983Term endedJan 2, 2000

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.