2520990

Information

• Patent Grant
• 2520990

• References
• Source

• Patent Number

  2,520,990

• Date Filed

  Not available

• Date Issued

  Tuesday, September 5, 1950
  74 years ago

• CPC

  • H03B7/04 - active element being vacuum tube

• US Classifications

  • 331 - Oscillators
  • 315 - Electric lamp and discharge devices: systems
  • 333 - Wave transmission lines and networks