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Expired European patentEurope

Method and control system for an ac induction motor

EP 1723716 B1 · Applicant: JÖNSSON, Ragnar

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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 10, 2005 and granted December 16, 2009. A European patent lasts at most 20 years from filing, so its term ended March 10, 2025.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 10, 2005
PublishedNovember 22, 2006
GrantedDecember 16, 2009
Term endedMarch 10, 2025
Application numberEP 05722199
Classification (CPC)H02P21/34

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedMarch 10, 2005PublishedNov 22, 2006Patent grantedDec 16, 2009Term endedMarch 10, 2025

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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