3454221

Information

• Patent Grant
• 3454221

• References
• Source

• Patent Number

  3,454,221

• Date Filed

  Not available

• Date Issued

  Tuesday, July 8, 1969
  55 years ago

• CPC

  • G05D23/2239 - using photoelectric elements

• US Classifications

  • 236 - Automatic temperature and humidity regulation
  • 219 - Electric heating
  • 425 - Plastic article or earthenware shaping or treating: apparatus