3731738

Information

• Patent Grant
• 3731738

• References
• Source

• Patent Number

  3,731,738

• Date Filed

  Not available

• Date Issued

  Tuesday, May 8, 1973
  52 years ago

• CPC

  • F28F21/082 - from steel or ferrous alloys
  • F28F1/12 - the means being only outside the tubular element
  • Y10S165/528 - Fin and conduit of diverse materials
  • Y10T428/12333 - Helical or with helical component
  • Y10T428/12458 - having composition, density, or hardness gradient
  • Y10T428/12965 - Both containing 0.01-1.7% carbon [i.e., steel]

• US Classifications

  • 165 - Heat exchange
  • 122 - Liquid heaters and vaporizers
  • 428 - Stock material or miscellaneous articles