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Screen grid structure for electron discharge tubes

US 2,613,331 A · Inventors: HENDRIK JONKER JOHAN LODEWIJK et al.

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted October 7, 1952. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by October 7, 1969.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledJuly 15, 1946
GrantedOctober 7, 1952
Term endedOctober 7, 1969
Application number—
Classification (CPC)H01J21/02
Length3 pages

Timeline

Timeline From USPTO dates

19471950195319561959196219651968Application filedJuly 15, 1946Patent grantedOct 7, 1952Term endedOct 7, 1969

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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