3272961

Information

• Patent Grant
• 3272961

• References
• Source

• Patent Number

  3,272,961

• Date Filed

  Not available

• Date Issued

  Tuesday, September 13, 1966
  58 years ago

• CPC

  • F22B37/103 - Internally ribbed tubes
  • B23K9/0325 - helicoidal seams

• US Classifications

  • 219 - Electric heating