3221135

Information

• Patent Grant
• 3221135

• References
• Source

• Patent Number

  3,221,135

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1965
  59 years ago

• CPC

  • F22B37/102 - Walls built-up from finned tubes
  • B23K9/0052 - Welding of pipe panels
  • B23K9/035 - with backing means disposed under the seam

• US Classifications

  • 219 - Electric heating