3805900

Information

• Patent Grant
• 3805900

• References
• Source

• Patent Number

  3,805,900

• Date Filed

  Not available

• Date Issued

  Tuesday, April 23, 1974
  50 years ago

• CPC

  • E21B25/04 - the core receiver having a core forming cutting edge or element
  • E21B25/14 - mounted on pivot transverse to core axis
  • E21B49/02 - by mechanically taking samples of the soil

• US Classifications

  • 175 - Boring or penetrating the earth