3705290

Information

• Patent Grant
• 3705290

• References
• Source

• Patent Number

  3,705,290

• Date Filed

  Not available

• Date Issued

  Tuesday, December 5, 1972
  52 years ago

• CPC

  • H02M5/20 - using discharge tubes without control electrode or semiconductor devices without control electrode

• US Classifications

  • 392 - Electric resistance heating devices