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Expired European patentEurope

Integrated circuit output buffer having improved ESD protection

EP 0371663 B1 · Applicant: AT&T Corp.

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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 November 16, 1989 and granted June 15, 1994. A European patent lasts at most 20 years from filing, so its term ended November 16, 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 May 16, 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.
FiledNovember 16, 1989
PublishedJune 6, 1990
GrantedJune 15, 1994
Term endedNovember 16, 2009
Application numberEP 89311910
Classification (CPC)H10D89/601

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 16, 1989PublishedJune 6, 1990Patent grantedJune 15, 1994Term endedNov 16, 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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