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Expired European patentEurope

Indirectly controlled switching system with time division junctures coupled over time division stages, in particular telephone switching system

EP 0006132 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 May 15, 1979 and granted May 12, 1982. A European patent lasts at most 20 years from filing, so its term ended May 15, 1999.
  • 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 November 15, 2004.
  • 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.
FiledMay 15, 1979
PublishedJanuary 9, 1980
GrantedMay 12, 1982
Term endedMay 15, 1999
Application numberEP 79101480
Classification (CPC)H04Q11/04

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMay 15, 1979PublishedJan 9, 1980Patent grantedMay 12, 1982Term endedMay 15, 1999

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.