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Expired European patentEurope

Field-directed screen help technique

EP 0171663 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 July 23, 1985 and granted February 20, 1991. A European patent lasts at most 20 years from filing, so its term ended July 23, 2005.
  • 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 January 23, 2011.
  • 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.
FiledJuly 23, 1985
PublishedFebruary 19, 1986
GrantedFebruary 20, 1991
Term endedJuly 23, 2005
Application numberEP 85109186
Classification (CPC)G06F3/0489 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJuly 23, 1985PublishedFeb 19, 1986Patent grantedFeb 20, 1991Term endedJuly 23, 2005

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.