3431973

Information

• Patent Grant
• 3431973

• References
• Source

• Patent Number

  3,431,973

• Date Filed

  Not available

• Date Issued

  Tuesday, March 11, 1969
  56 years ago

• CPC

  • B21D53/08 - of both metal tubes and sheet metal
  • B21C37/225 - longitudinally-ribbed tubes
  • F28F1/12 - the means being only outside the tubular element

• US Classifications

  • 165 - Heat exchange