2840493

Information

• Patent Grant
• 2840493

• References
• Source

• Patent Number

  2,840,493

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1958
  67 years ago

• CPC

  • H01J25/52 - with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
  • H01J19/00 - Details of vacuum tubes of the types covered by group H01J21/00
  • H01J2893/0023 - carbonising and other surface treatments
  • Y10S428/938 - Vapor deposition or gas diffusion
  • Y10T428/12611 - Oxide-containing component
  • Y10T428/12806 - Refractory [Group IVB, VB, or VIB] metal-base component
  • Y10T428/12812 - Diverse refractory group metal-base components: alternative to or next to each other

• US Classifications

  • 427 - Coating processes
  • 428 - Stock material or miscellaneous articles