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Expired European patentEurope

Method of preparing oriented, polycrystalline superconducting ceramic oxides

EP 0447767 B1 · Applicant: International Business Machines 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 January 31, 1991 and granted July 27, 1994. A European patent lasts at most 20 years from filing, so its term ended January 31, 2011.
  • 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 July 31, 2016.
  • 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.
FiledJanuary 31, 1991
PublishedSeptember 25, 1991
GrantedJuly 27, 1994
Term endedJanuary 31, 2011
Application numberEP 91101250
Classification (CPC)H10N60/0548

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 31, 1991PublishedSep 25, 1991Patent grantedJuly 27, 1994Term endedJan 31, 2011

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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