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Expired European patentEurope

Hollow cathodes for plasma-containing display devices and method of producing same

EP 0835502 B1 · Applicant: Koninklijke Philips Electronics N.V.

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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 10, 1997 and granted March 17, 2004. A European patent lasts at most 20 years from filing, so its term ended April 10, 2017.
  • 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 10, 2022.
  • 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 10, 1997
PublishedApril 15, 1998
GrantedMarch 17, 2004
Term endedApril 10, 2017
Application numberEP 97908470
Classification (CPC)H01J17/485

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedApril 10, 1997PublishedApril 15, 1998Patent grantedMarch 17, 2004Term endedApril 10, 2017

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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