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Expired European patentEurope

Method of operating a data processing system via depictor-linked microcode and logic circuitry

EP 0138352 B1 · Applicant: UNISYS CORPORATION

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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 August 31, 1984 and granted June 19, 1991. A European patent lasts at most 20 years from filing, so its term ended August 31, 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 March 3, 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.
FiledAugust 31, 1984
PublishedApril 24, 1985
GrantedJune 19, 1991
Term endedAugust 31, 2004
Application numberEP 84305968
Classification (CPC)G06F9/4486

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedAug 31, 1984PublishedApril 24, 1985Patent grantedJune 19, 1991Term endedAug 31, 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

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