2399438

Information

• Patent Grant
• 2399438

• References
• Source

• Patent Number

  2,399,438

• Date Filed

  Not available

• Date Issued

  Tuesday, April 30, 1946
  78 years ago

• CPC

  • E21C37/08 - Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 091 - Motors: expansible chamber type
  • 254 - Implements or apparatus for applying pushing or pulling force