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Expired European patentEurope

Cold-cathode electron source, microwave tube using this, and its manufacturing method

EP 1594150 B1 · Applicant: Sumitomo Electric Industries, Ltd.

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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 March 26, 2004 and granted July 13, 2011. A European patent lasts at most 20 years from filing, so its term ended March 26, 2024.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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.
FiledMarch 26, 2004
PublishedNovember 9, 2005
GrantedJuly 13, 2011
Term endedMarch 26, 2024
Application numberEP 04723735
Classification (CPC)H01J23/06 +2 more

Timeline

Timeline From EPO dates

2005200720092011201320152017201920212023Application filedMarch 26, 2004PublishedNov 9, 2005Patent grantedJuly 13, 2011Term endedMarch 26, 2024

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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