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European application, no grantEurope

Improvements relating to DC-DC converters

EP 0449504 A2 · Applicant: THE PLESSEY COMPANY LIMITED

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Overview

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

Read the whole patent

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 21, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended March 21, 2011.
  • 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 21, 2016.
  • 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 21, 1991
PublishedOctober 2, 1991
GrantedNever granted
Term endedMarch 21, 2011
Application numberEP 91302462
Classification (CPC)H02M3/33561 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 21, 1991PublishedOct 2, 1991Term endedMarch 21, 2011

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.