Patent Yard Sign in
Expired European patentEurope

Method of transmitting information between stations attached to a unidirectional transmission ring

EP 0054077 B1 · Applicant: International Business Machines Corporation

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed December 8, 1980 and granted November 21, 1984. A European patent lasts at most 20 years from filing, so its term ended December 8, 2000.
  • 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 8, 2006.
  • 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 8, 1980
PublishedJune 23, 1982
GrantedNovember 21, 1984
Term endedDecember 8, 2000
Application numberEP 80107706
Classification (CPC)H04L12/64 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 8, 1980PublishedJune 23, 1982Patent grantedNov 21, 1984Term endedDec 8, 2000

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.