1639172

Information

• Patent Grant
• 1639172

• References
• Source

• Patent Number

  1,639,172

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1927
  97 years ago

• CPC

  • F28D1/0472 - the conduits being helically or spirally coiled
  • Y10S165/496 - Spiral or helical coil

• US Classifications

  • 165 - Heat exchange