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Expired European patentEurope

Timed token ring with multiple priorities

EP 0089159 B1 · Applicant: BURROUGHS CORPORATION (a Delaware corporation)

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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 March 4, 1983 and granted January 29, 1986. A European patent lasts at most 20 years from filing, so its term ended March 4, 2003.
  • 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 September 4, 2008.
  • 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.
FiledMarch 4, 1983
PublishedSeptember 21, 1983
GrantedJanuary 29, 1986
Term endedMarch 4, 2003
Application numberEP 83301185
Classification (CPC)H04L12/433

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMarch 4, 1983PublishedSep 21, 1983Patent grantedJan 29, 1986Term endedMarch 4, 2003

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.