3647009

Information

• Patent Grant
• 3647009

• References
• Source

• Patent Number

  3,647,009

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1972
  52 years ago

• CPC

  • E21B25/18 - the core receiver being specially adapted for operation under water
  • E21B25/14 - mounted on pivot transverse to core axis

• US Classifications

  • 175 - Boring or penetrating the earth