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Expired European patentEurope

Circuit for ringing signal generation for subscriber circuits

EP 1017220 B1 · Applicant: STMicroelectronics S.r.l.

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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 December 30, 1999 and granted May 2, 2007. A European patent lasts at most 20 years from filing, so its term ended December 30, 2019.
  • 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 June 30, 2025.
  • 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.
FiledDecember 30, 1999
PublishedJuly 5, 2000
GrantedMay 2, 2007
Term endedDecember 30, 2019
Application numberEP 99126234
Classification (CPC)H04M19/02

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedDec 30, 1999PublishedJuly 5, 2000Patent grantedMay 2, 2007Term endedDec 30, 2019

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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