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Expired European patentEurope

Switching power supply

EP 0142809 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 November 12, 1984 and granted March 18, 1987. A European patent lasts at most 20 years from filing, so its term ended November 12, 2004.
  • 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 May 12, 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.
FiledNovember 12, 1984
PublishedMay 29, 1985
GrantedMarch 18, 1987
Term endedNovember 12, 2004
Application numberEP 84113639
Classification (CPC)H02M1/12

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 12, 1984PublishedMay 29, 1985Patent grantedMarch 18, 1987Term endedNov 12, 2004

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.