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Expired European patentEurope

Ordered corundum magnesium tantalum niobium oxide x-ray intensifying screens

EP 0484255 B1 · Applicant: EASTMAN KODAK COMPANY (a New Jersey 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 October 25, 1991 and granted July 20, 1994. A European patent lasts at most 20 years from filing, so its term ended October 25, 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 April 25, 2017.
  • 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.
FiledOctober 25, 1991
PublishedMay 6, 1992
GrantedJuly 20, 1994
Term endedOctober 25, 2011
Application numberEP 91420381
Classification (CPC)G21K4/00 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedOct 25, 1991PublishedMay 6, 1992Patent grantedJuly 20, 1994Term endedOct 25, 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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