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Expired European patentEurope

Method and device for the optical transmission of electrical signals with positive and negative voltage values

EP 0091546 B1 · Applicant: Richard Hirschmann Radiotechnisches Werk

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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 February 19, 1983 and granted May 20, 1987. A European patent lasts at most 20 years from filing, so its term ended February 19, 2003.
  • 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 August 19, 2008.
  • 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.
FiledFebruary 19, 1983
PublishedOctober 19, 1983
GrantedMay 20, 1987
Term endedFebruary 19, 2003
Application numberEP 83101590
Classification (CPC)G08C23/06

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedFeb 19, 1983PublishedOct 19, 1983Patent grantedMay 20, 1987Term endedFeb 19, 2003

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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