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European application, no grantEurope

Circuit for controlling field-controlled power switches

EP 0555648 A2 · Applicant: HEINRICH KOPP AG

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 14, 1993 and never granted as a European patent. Had it been granted, its 20-year term would have ended January 14, 2013.
  • 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 14, 2018.
  • 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 14, 1993
PublishedAugust 18, 1993
GrantedNever granted
Term endedJanuary 14, 2013
Application numberEP 93100469
Classification (CPC)H03K17/687 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJan 14, 1993PublishedAug 18, 1993Term endedJan 14, 2013

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.