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Expired European patentEurope

System for the transmission of HDLC frames on a PCM channel using a single HDLC circuit, and transposition buffer memory

EP 0377204 B1 · Applicant: ALCATEL CIT

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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 December 27, 1989 and granted June 29, 1994. A European patent lasts at most 20 years from filing, so its term ended December 27, 2009.
  • 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 27, 2015.
  • 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 27, 1989
PublishedJuly 11, 1990
GrantedJune 29, 1994
Term endedDecember 27, 2009
Application numberEP 89123956
Classification (CPC)H04L9/40 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedDec 27, 1989PublishedJuly 11, 1990Patent grantedJune 29, 1994Term endedDec 27, 2009

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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