Class E21B : EARTH OR ROCK DRILLING
Subclass 1/32: 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 air, steam or gas pressure working with pulses
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11421478 | Support features for extendable elements of a downhole tool body, tool bodies having such support features and related methods | Mar 11, 16 | Aug 23, 22 | Baker Hughes Holdings LLC |
| 7255516 | Method and apparatus for replacement of underground pipe | Jul 01, 05 | Aug 14, 07 | EARTH TOOL COMPANY, LLC |
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