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Expired European patentEurope

Process and device for controlling and regulating a switching current supply unit

EP 0286909 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 March 29, 1988 and granted August 14, 1991. A European patent lasts at most 20 years from filing, so its term ended March 29, 2008.
  • 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 29, 2013.
  • 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 29, 1988
PublishedOctober 19, 1988
GrantedAugust 14, 1991
Term endedMarch 29, 2008
Application numberEP 88105120
Classification (CPC)H02M1/36

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 29, 1988PublishedOct 19, 1988Patent grantedAug 14, 1991Term endedMarch 29, 2008

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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