3475055

Information

• Patent Grant
• 3475055

• References
• Source

• Patent Number

  3,475,055

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1969
  55 years ago

• CPC

  • E21D9/10 - Making by using boring or cutting machines
  • E21B7/14 - Drilling by use of heat
  • E21D9/1073 - applying thermal energy

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth
  • 239 - Fluid sprinkling, spraying, and diffusing