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Expired European patentEurope

Apparatus for controlling the application of telephone line power in a telephone set

EP 0112840 B1 · Applicant: Western Electric Company, Incorporated

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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 January 17, 1983 and granted December 3, 1986. A European patent lasts at most 20 years from filing, so its term ended January 17, 2003.
  • 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 July 17, 2008.
  • 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.
FiledJanuary 17, 1983
PublishedJuly 11, 1984
GrantedDecember 3, 1986
Term endedJanuary 17, 2003
Application numberEP 83900603
Classification (CPC)H04M19/08

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedJan 17, 1983PublishedJuly 11, 1984Patent grantedDec 3, 1986Term endedJan 17, 2003

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.