2220028

Information

• Patent Grant
• 2220028

• References
• Source

• Patent Number

  2,220,028

• Date Filed

  Not available

• Date Issued

  Tuesday, October 29, 1940
  84 years ago

• CPC

  • G05D23/20 - with sensing elements having variation of electric or magnetic properties with change of temperature
  • G05D23/1913 - delivering a series of pulses
  • Y10S236/14 - intermittant control

• US Classifications

  • 236 - Automatic temperature and humidity regulation
  • 219 - Electric heating
  • 373 - Industrial electric heating furnaces