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Expired European patentEurope

Synchronisation method for SDH-systems and method and circuit for the recognition of various data structures

EP 0453876 B1 · Applicant: Alcatel SEL 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 April 11, 1991 and granted June 11, 1997. A European patent lasts at most 20 years from filing, so its term ended April 11, 2011.
  • 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 October 11, 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.
FiledApril 11, 1991
PublishedOctober 30, 1991
GrantedJune 11, 1997
Term endedApril 11, 2011
Application numberEP 91105725
Classification (CPC)H04J3/0608

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 11, 1991PublishedOct 30, 1991Patent grantedJune 11, 1997Term endedApril 11, 2011

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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