2137198

Information

• Patent Grant
• 2137198

• References
• Source

• Patent Number

  2,137,198

• Date Filed

  Not available

• Date Issued

  Tuesday, November 15, 1938
  87 years ago

• CPC

  • H01J3/025 - Electron guns using a discharge in a gas or a vapour as electron source
  • H01J2893/0062 - Tubes with temperature ionized gas as electron source

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 417 - Pumps