2250581

Information

• Patent Grant
• 2250581

• References
• Source

• Patent Number

  2,250,581

• Date Filed

  Not available

• Date Issued

  Tuesday, July 29, 1941
  83 years ago

• CPC

  • H03G1/0035 - using continuously variable impedance elements
  • H03G3/16 - having discharge tubes

• US Classifications

  • 455 - Telecommunications
  • 330 - Amplifiers