3404874

Information

• Patent Grant
• 3404874

• References
• Source

• Patent Number

  3,404,874

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1968
  56 years ago

• CPC

  • F27D99/0006 - Electric heating elements or system
  • C21D1/773 - under reduced pressure or vacuum
  • C21D9/00 - Heat treatment
  • C21D9/561 - with a controlled atmosphere or vacuum
  • C21D9/565 - Sealing arrangements
  • F27B5/04 - adapted for treating the charge in vacuum or special atmosphere
  • F27B9/28 - for treating continuous lengths of work
  • F27D11/02 - Ohmic resistance heating
  • H05B3/66 - Supports or mountings for heaters on or in the wall or roof
  • F27D2007/066 - Vacuum
  • F27D2099/0026 - with a generator of electromagnetic radiations

• US Classifications

  • 266 - Metallurgical apparatus
  • 373 - Industrial electric heating furnaces
  • 392 - Electric resistance heating devices