2490847

Information

• Patent Grant
• 2490847

• References
• Source

• Patent Number

  2,490,847

• Date Filed

  Not available

• Date Issued

  Tuesday, December 13, 1949
  75 years ago

• CPC

  • H03F1/546 - Delaying application of anode power supply with respect to application of filament heating power supply
  • Y10T307/74 - Switching systems

• US Classifications

  • 307 - Electrical transmission or interconnection systems
  • 315 - Electric lamp and discharge devices: systems