Class E21B : EARTH OR ROCK DRILLING
Subclass 1/28: Percussion drilling (drives used in the borehole E21B 4/00) with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) the impulse member being a piston driven directly by fluid pressure by liquid pressure working with pulses
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12252937 | Drilling device with fluid column resonator | Nov 05, 21 | Mar 18, 25 | MINCON INTERNATIONAL LIMITED |
| 7958952 | Pulse rate of penetration enhancement device and method | Dec 17, 08 | Jun 14, 11 | TELEDRILL, INC. |
| 7240744 | Rotary and mud-powered percussive drill bit assembly and method | Jun 28, 06 | Jul 10, 07 | ENERGY TECHNOLOGIES, ENERGY TECHNOLOGY GROUP, LLC, |
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