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Expired European patentEurope

Logic circuit comprising a switched anti-stress transistor

EP 0327159 B1 · Applicant: Philips Electronics N.V.

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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 25, 1989 and granted October 16, 1991. A European patent lasts at most 20 years from filing, so its term ended January 25, 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 July 25, 2014.
  • 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 25, 1989
PublishedAugust 9, 1989
GrantedOctober 16, 1991
Term endedJanuary 25, 2009
Application numberEP 89200158
Classification (CPC)H03K19/00315

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedJan 25, 1989PublishedAug 9, 1989Patent grantedOct 16, 1991Term endedJan 25, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.