3902552

Information

• Patent Grant
• 3902552

• References
• Source

• Patent Number

  3,902,552

• Date Filed

  Not available

• Date Issued

  Tuesday, September 2, 1975
  49 years ago

• CPC

  • F28F1/426 - the outside portions and the inside portions forming parts of complementary shape
  • B21C37/0803 - the tubes having a special shape
  • F28F1/42 - the means being both outside and inside the tubular element
  • Y10S165/515 - Patterned surface

• US Classifications

  • 165 - Heat exchange
  • 138 - Pipes and tubular conduits
  • 228 - Metal fusion bonding