3851138

Information

• Patent Grant
• 3851138

• References
• Source

• Patent Number

  3,851,138

• Date Filed

  Not available

• Date Issued

  Tuesday, November 26, 1974
  50 years ago

• CPC

  • B21D5/08 - making use of forming-rollers
  • B21B45/004 - Heating the product
  • B21D19/04 - shaped as rollers
  • B21H1/06 - rings of restricted axial length
  • B21H7/00 - Making articles not provided for in the preceding groups
  • B23K11/06 - using roller electrodes
  • B23K11/087 - for rectilinear seams
  • B23K20/00 - Non-electric welding by applying impact or other pressure, with or without the application of heat
  • B21B2027/086 - heating internally

• US Classifications

  • 219 - Electric heating