2491284

Information

• Patent Grant
• 2491284

• References
• Source

• Patent Number

  2,491,284

• Date Filed

  Not available

• Date Issued

  Tuesday, December 13, 1949
  75 years ago

• CPC

  • H01J19/00 - Details of vacuum tubes of the types covered by group H01J21/00
  • H01J19/30 - characterised by the material
  • H01J2893/0019 - Chemical composition and manufacture
  • H01J2893/0023 - carbonising and other surface treatments
  • Y10T428/12042 - Porous component
  • Y10T428/1209 - Plural particulate metal components
  • Y10T428/12174 - Mo or W containing

• US Classifications

  • 428 - Stock material or miscellaneous articles
  • 148 - Metal treatment
  • 313 - Electric lamp and discharge devices
  • 416 - Fluid reaction surfaces
  • 419 - Powder metallurgy processes
  • 427 - Coating processes