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Expired European patentEurope

Method of producing a ceramic arc tube of a metal vapour discharge lamp and ceramic arc tube thereby produced

EP 0034056 B1 · Applicant: NGK INSULATORS, LTD.

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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 February 6, 1981 and granted September 14, 1983. A European patent lasts at most 20 years from filing, so its term ended February 6, 2001.
  • 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 August 6, 2006.
  • 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.
FiledFebruary 6, 1981
PublishedAugust 19, 1981
GrantedSeptember 14, 1983
Term endedFebruary 6, 2001
Application numberEP 81300508
Classification (CPC)H01J61/30 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedFeb 6, 1981PublishedAug 19, 1981Patent grantedSep 14, 1983Term endedFeb 6, 2001

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.