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Expired European patentEurope

Device for the galvanic insulation of DC electrical signals or signals containing a DC component

EP 0505283 B1 · Applicant: GEC ALSTHOM SA

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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 20, 1992 and granted July 24, 1996. A European patent lasts at most 20 years from filing, so its term ended March 20, 2012.
  • 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 20, 2017.
  • 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 20, 1992
PublishedSeptember 23, 1992
GrantedJuly 24, 1996
Term endedMarch 20, 2012
Application numberEP 92400758
Classification (CPC)H03K17/785 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 20, 1992PublishedSep 23, 1992Patent grantedJuly 24, 1996Term endedMarch 20, 2012

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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