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Expired European patentEurope

Switch for controlling current flow in superconductors

EP 0454589 B1 · Applicant: RAILWAY TECHNICAL RESEARCH INSTITUTE

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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 April 26, 1991 and granted November 8, 1995. A European patent lasts at most 20 years from filing, so its term ended April 26, 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 October 26, 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.
FiledApril 26, 1991
PublishedOctober 30, 1991
GrantedNovember 8, 1995
Term endedApril 26, 2011
Application numberEP 91401119
Classification (CPC)H10N60/355

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 26, 1991PublishedOct 30, 1991Patent grantedNov 8, 1995Term endedApril 26, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.