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Expired European patentEurope

Line circuit for driving a ringer and a service indicating lamp in a telephone set

EP 0187366 B1 · Applicant: FUJITSU LIMITED

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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 December 23, 1985 and granted March 11, 1992. A European patent lasts at most 20 years from filing, so its term ended December 23, 2005.
  • 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 23, 2011.
  • 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 23, 1985
PublishedJuly 16, 1986
GrantedMarch 11, 1992
Term endedDecember 23, 2005
Application numberEP 85116458
Classification (CPC)H04M19/023 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedDec 23, 1985PublishedJuly 16, 1986Patent grantedMarch 11, 1992Term endedDec 23, 2005

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.