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Expired European patentEurope

Digital message switching unit and digital message switching system

EP 0549938 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 December 11, 1992 and granted November 14, 2001. A European patent lasts at most 20 years from filing, so its term ended December 11, 2012.
  • 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 11, 2018.
  • 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 11, 1992
PublishedJuly 7, 1993
GrantedNovember 14, 2001
Term endedDecember 11, 2012
Application numberEP 92121164
Classification (CPC)H04Q11/0442

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedDec 11, 1992PublishedJuly 7, 1993Patent grantedNov 14, 2001Term endedDec 11, 2012

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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