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Expired European patentEurope

An interactive discharge system

EP 0156052 B1 · Applicant: International Business Machines Corporation

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Overview

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

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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 23, 1984 and granted December 20, 1989. A European patent lasts at most 20 years from filing, so its term ended March 23, 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 September 23, 2009.
  • 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 23, 1984
PublishedOctober 2, 1985
GrantedDecember 20, 1989
Term endedMarch 23, 2004
Application numberEP 84301974
Classification (CPC)G06F3/0481 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 23, 1984PublishedOct 2, 1985Patent grantedDec 20, 1989Term endedMarch 23, 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.