1809240

Information

• Patent Grant
• 1809240

• References
• Source

• Patent Number

  1,809,240

• Date Filed

  Not available

• Date Issued

  Tuesday, June 9, 1931
  93 years ago

• CPC

  • F22D1/04 - the tubes having plain outer surfaces

• US Classifications

  • 165 - Heat exchange
  • 122 - Liquid heaters and vaporizers