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Expired European patentEurope

Circuit for reversing a magnetic field

EP 0561775 B1 · Applicant: Deutsche Thomson-Brandt 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 November 17, 1989 and granted February 15, 1995. A European patent lasts at most 20 years from filing, so its term ended November 17, 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 17, 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 17, 1989
PublishedSeptember 29, 1993
GrantedFebruary 15, 1995
Term endedNovember 17, 2009
Application numberEP 90900803
Classification (CPC)H03K17/04 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 17, 1989PublishedSep 29, 1993Patent grantedFeb 15, 1995Term endedNov 17, 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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