2703921

Information

• Patent Grant
• 2703921

• References
• Source

• Patent Number

  2,703,921

• Date Filed

  Not available

• Date Issued

  Tuesday, March 15, 1955
  70 years ago

• CPC

  • F28F1/42 - the means being both outside and inside the tubular element
  • B21C37/225 - longitudinally-ribbed tubes
  • F28D7/103 - consisting of more than two coaxial conduits or modules of more than two coaxial conduits
  • F28D7/106 - consisting of two coaxial conduits or modules of two coaxial conduits
  • F28F1/14 - and extending longitudinally
  • F28F13/18 - by applying coatings
  • Y10S220/921 - Spacing element of unitary construction with one wall
  • Y10T29/49361 - Tube inside tube
  • Y10T29/49378 - Finned tube

• US Classifications

  • 029 - Metal working
  • 165 - Heat exchange
  • 220 - Receptacles