3764774

Information

• Patent Grant
• 3764774

• References
• Source

• Patent Number

  3,764,774

• Date Filed

  Not available

• Date Issued

  Tuesday, October 9, 1973
  51 years ago

• CPC

  • F28F1/36 - the means being helically wound fins or wire spirals
  • B21C37/26 - helically-ribbed tubes
  • B23K11/0046 - the extremity of a small piece being welded to a base
  • B23K11/084 - of helicoïdal seams

• US Classifications

  • 219 - Electric heating