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Expired European patentEurope

High efficiency photoluminescent material for optical upconversion and a process for making the same

EP 0394530 B1 · Applicant: QUANTEX 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 April 27, 1989 and granted September 15, 1993. A European patent lasts at most 20 years from filing, so its term ended April 27, 2009.
  • 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 27, 2014.
  • 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 27, 1989
PublishedOctober 31, 1990
GrantedSeptember 15, 1993
Term endedApril 27, 2009
Application numberEP 89107655
Classification (CPC)G01T1/2012 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 27, 1989PublishedOct 31, 1990Patent grantedSep 15, 1993Term endedApril 27, 2009

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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