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Expired European patentEurope

Power control circuit and an intermittent voltage supply using such a circuit

EP 0002983 B1 · Applicant: THOMSON-CSF

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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 December 15, 1978 and granted August 5, 1981. A European patent lasts at most 20 years from filing, so its term ended December 15, 1998.
  • 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 June 15, 2004.
  • 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.
FiledDecember 15, 1978
PublishedJuly 11, 1979
GrantedAugust 5, 1981
Term endedDecember 15, 1998
Application numberEP 78400243
Classification (CPC)H02M3/335 +1 more

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedDec 15, 1978PublishedJuly 11, 1979Patent grantedAug 5, 1981Term endedDec 15, 1998

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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