2226561

Information

• Patent Grant
• 2226561

• References
• Source

• Patent Number

  2,226,561

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1940
  84 years ago

• CPC

  • H03K4/10 - using as active elements vacuum tubes only
  • H03B7/04 - active element being vacuum tube

• US Classifications

  • 331 - Oscillators
  • 330 - Amplifiers