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Expired European patentEurope

Signal-evaluation circuit for an apparatus for measurement of extinction

EP 0020877 B1 · Applicant: Bodenseewerk Geosystem GmbH

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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 28, 1980 and granted August 31, 1983. A European patent lasts at most 20 years from filing, so its term ended March 28, 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 September 28, 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.
FiledMarch 28, 1980
PublishedJanuary 7, 1981
GrantedAugust 31, 1983
Term endedMarch 28, 2000
Application numberEP 80101677
Classification (CPC)G01N21/314

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedMarch 28, 1980PublishedJan 7, 1981Patent grantedAug 31, 1983Term endedMarch 28, 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

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