3220470

Information

• Patent Grant
• 3220470

• References
• Source

• Patent Number

  3,220,470

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1965
  59 years ago

• CPC

  • E21D1/14 - Freezing apparatus
  • E02D3/115 - by freezing
  • Y10S159/902 - using natural heat

• US Classifications

  • 165 - Heat exchange
  • 062 - Refrigeration
  • 159 - Concentrating evaporators
  • 166 - Wells
  • 236 - Automatic temperature and humidity regulation
  • 405 - Hydraulic and earth engineering