Class E21B : EARTH OR ROCK DRILLING
Subclass 1/26: 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
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12234690 | Experimental apparatus for rock-breaking through vibration impact | May 12, 23 | Feb 25, 25 | CHINA UNIVERSITY OF PETROLEUM - BEIJING (CUPB) |
| 12134937 | Impact piston device for a impact drill drive | Apr 10, 23 | Nov 05, 24 | Eurodrill GmbH |
| 11821312 | Drilling rig and methods using multiple types of drilling for installing geothermal systems | Dec 20, 19 | Nov 21, 23 | Terra Sonic International, LLC |
| 11686157 | Pressure reversing valve for a fluid-actuated, percussive drilling tool | Feb 17, 22 | Jun 27, 23 | Not available |
| 11542751 | Multi-function drilling tool | Apr 23, 21 | Jan 03, 23 | SOUTHWEST PETROLEUM UNIVERSITY; Sichuan Jutingzao Technology Co., Ltd.; |
| 11408227 | Horizontal drilling machine with impact device | Sep 27, 21 | Aug 09, 22 | Hunan University of Science and Technology |
| 11391091 | Modular reaming device | Aug 17, 16 | Jul 19, 22 | Halliburton Energy Services Inc. |
| 11174680 | Pressurized fluid flow system having multiple work chambers for a DTH hammer and normal circulation hammer thereof | Dec 13, 17 | Nov 16, 21 | Not available |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0101,807 | HYDRAULIC IMPACT MECHANISM FOR USE IN EQUIPMENT FOR PROCESSING ROCK AND CONCRETE | Feb 22, 23 | Mar 27, 25 | Not available |
| 2025/0027,368 | VALVE CYLINDER, IMPACT DEVICE AND METHOD | Dec 02, 22 | Jan 23, 25 | Not available |
| 2024/0337,157 | VALVE-CONTROLLED HIGH-ENERGY HYDROSTATIC DOWN-THE-HOLE IMPACT HAMMER | Mar 11, 24 | Oct 10, 24 | Not available |
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