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Expired European patentEurope

PbO-FREE GLASSES FOR CATHODE RAY TUBES WITH STRONG PROTECTIVE EFFECT AGAINST X RAYS, AND ALSO GOOD RESISTANCE TO ACIDS AND GOOD STABILITY TO RADIATIONS

EP 0127633 B1 · Applicant: Schott Glaswerke

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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 November 24, 1983 and granted April 23, 1986. A European patent lasts at most 20 years from filing, so its term ended November 24, 2003.
  • 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 May 24, 2009.
  • 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.
FiledNovember 24, 1983
PublishedDecember 12, 1984
GrantedApril 23, 1986
Term endedNovember 24, 2003
Application numberEP 83903526
Classification (CPC)C03C4/087 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedNov 24, 1983PublishedDec 12, 1984Patent grantedApril 23, 1986Term endedNov 24, 2003

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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