2471457

Information

• Patent Grant
• 2471457

• References
• Source

• Patent Number

  2,471,457

• Date Filed

  Not available

• Date Issued

  Tuesday, May 31, 1949
  75 years ago

• CPC

  • H01H43/308 - based on the change of electrical properties
  • H01C7/04 - having negative temperature coefficient

• US Classifications

  • 236 - Automatic temperature and humidity regulation
  • 219 - Electric heating
  • 323 - Electricity: power supply or regulation systems
  • 361 - Electricity: electrical systems and devices