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Expired European patentEurope

A so-called switching voltage regulator for an interface circuit in a telephone subscriber line

EP 0284571 B1 · Applicant: SGS-THOMSON MICROELECTRONICS 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 March 14, 1988 and granted April 28, 1993. A European patent lasts at most 20 years from filing, so its term ended March 14, 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 14, 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 14, 1988
PublishedSeptember 28, 1988
GrantedApril 28, 1993
Term endedMarch 14, 2008
Application numberEP 88830096
Classification (CPC)H04M19/008

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 14, 1988PublishedSep 28, 1988Patent grantedApril 28, 1993Term endedMarch 14, 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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