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Expired European patentEurope

Programm-controlled communications system, especially switching exchange

EP 0472775 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 August 31, 1990 and granted February 7, 1996. A European patent lasts at most 20 years from filing, so its term ended August 31, 2010.
  • 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 March 2, 2016.
  • 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.
FiledAugust 31, 1990
PublishedMarch 4, 1992
GrantedFebruary 7, 1996
Term endedAugust 31, 2010
Application numberEP 90116789
Classification (CPC)H04Q3/545

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedAug 31, 1990PublishedMarch 4, 1992Patent grantedFeb 7, 1996Term endedAug 31, 2010

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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