3340939

Information

• Patent Grant
• 3340939

• References
• Source

• Patent Number

  3,340,939

• Date Filed

  Not available

• Date Issued

  Tuesday, September 12, 1967
  57 years ago

• CPC

  • E21B25/02 - the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
  • E21B25/12 - of the sliding wedge type

• US Classifications

  • 175 - Boring or penetrating the earth