2138593

Information

• Patent Grant
• 2138593

• References
• Source

• Patent Number

  2,138,593

• Date Filed

  Not available

• Date Issued

  Tuesday, November 29, 1938
  86 years ago

• CPC

  • G05D23/2239 - using photoelectric elements

• US Classifications

  • 236 - Automatic temperature and humidity regulation
  • 136 - Batteries: thermoelectric and photoelectric
  • 361 - Electricity: electrical systems and devices
  • 374 - Thermal measuring and testing