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Expired European patentEurope

Method for the transmission of information between devices of an indirectly controlled switching system, in particular a telephone switching system

EP 0011153 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 October 19, 1979 and granted December 7, 1983. A European patent lasts at most 20 years from filing, so its term ended October 19, 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 April 19, 2005.
  • 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.
FiledOctober 19, 1979
PublishedMay 28, 1980
GrantedDecember 7, 1983
Term endedOctober 19, 1999
Application numberEP 79104065
Classification (CPC)H04Q11/0407

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedOct 19, 1979PublishedMay 28, 1980Patent grantedDec 7, 1983Term endedOct 19, 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

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