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Expired European patentEurope

Soft-start control for a push-pull converter-regulator with a flux balancing circuit

EP 0172891 B1 · Applicant: SUNDSTRAND CORPORATION

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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 February 22, 1985 and granted February 14, 1990. A European patent lasts at most 20 years from filing, so its term ended February 22, 2005.
  • 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 August 22, 2010.
  • 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.
FiledFebruary 22, 1985
PublishedMarch 5, 1986
GrantedFebruary 14, 1990
Term endedFebruary 22, 2005
Application numberEP 85901270
Classification (CPC)H02M1/36 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedFeb 22, 1985PublishedMarch 5, 1986Patent grantedFeb 14, 1990Term endedFeb 22, 2005

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.