Patent Yard Sign in
Expired European patentEurope

Fast circuit switching system

EP 0146292 B1 · Applicant: AT&T Corp.

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 November 30, 1984 and granted August 24, 1988. A European patent lasts at most 20 years from filing, so its term ended November 30, 2004.
  • 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 May 30, 2010.
  • 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.
FiledNovember 30, 1984
PublishedJune 26, 1985
GrantedAugust 24, 1988
Term endedNovember 30, 2004
Application numberEP 84308316
Classification (CPC)H04L12/52

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 30, 1984PublishedJune 26, 1985Patent grantedAug 24, 1988Term endedNov 30, 2004

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.