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Expired European patentEurope

Pulse polarity modulation circuit

EP 1662666 B1 · Applicant: FUJITSU LIMITED

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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 28, 2005 and granted December 19, 2012. A European patent lasts at most 20 years from filing, so its term ended February 28, 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.
FiledFebruary 28, 2005
PublishedMay 31, 2006
GrantedDecember 19, 2012
Term endedFebruary 28, 2025
Application numberEP 05251159
Classification (CPC)H03M5/18

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedFeb 28, 2005PublishedMay 31, 2006Patent grantedDec 19, 2012Term endedFeb 28, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.