2491990

Information

• Patent Grant
• 2491990

• References
• Source

• Patent Number

  2,491,990

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1949
  75 years ago

• CPC

  • H01J13/02 - Details
  • H01J2893/0073 - Discharge tubes with liquid poolcathodes constructional details

• US Classifications

  • 315 - Electric lamp and discharge devices: systems
  • 313 - Electric lamp and discharge devices