2499233

Information

• Patent Grant
• 2499233

• References
• Source

• Patent Number

  2,499,233

• Date Filed

  Not available

• Date Issued

  Tuesday, February 28, 1950
  75 years ago

• CPC

  • G02F1/17 - based on variable absorption elements
  • H01T14/00 - Spark gaps not provided for in groups H01T2/00 - H01T13/00
  • H04N3/12 - by switched stationary formation of lamps, photocells or light relays
  • H04R23/004 - using ionised gas

• US Classifications

  • 315 - Electric lamp and discharge devices: systems
  • 348 - Television