3639723

Information

• Patent Grant
• 3639723

• References
• Source

• Patent Number

  3,639,723

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  52 years ago

• CPC

  • B23K9/1037 - Means preventing crater forming at the extremity of the seam

• US Classifications

  • 219 - Electric heating