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Expired European patentEurope

Improved electrode for metal halide discharge lamp

EP 0517907 B1 · Applicant: WELCH ALLYN, INC.

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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 December 30, 1991 and granted March 19, 1997. A European patent lasts at most 20 years from filing, so its term ended December 30, 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 June 30, 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.
FiledDecember 30, 1991
PublishedDecember 16, 1992
GrantedMarch 19, 1997
Term endedDecember 30, 2011
Application numberEP 92904227
Classification (CPC)H01J61/0732

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedDec 30, 1991PublishedDec 16, 1992Patent grantedMarch 19, 1997Term endedDec 30, 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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