2090304

Information

• Patent Grant
• 2090304

• References
• Source

• Patent Number

  2,090,304

• Date Filed

  Not available

• Date Issued

  Tuesday, August 17, 1937
  87 years ago

• CPC

  • E21B25/10 - Formed core retaining or severing means
  • E21B4/04 - Electric drives
  • E21B4/16 - Plural down-hole drives
  • E21B7/007 - Drilling by use of explosives
  • E21B25/00 - Apparatus for obtaining or removing undisturbed cores
  • E21B25/12 - of the sliding wedge type
  • E21B31/18 - gripping externally
  • E21B41/00 - Equipment or details not covered by groups E21B15/00 - E21B40/00

• US Classifications

  • 175 - Boring or penetrating the earth
  • 294 - Handling: hand and hoist-line implements