| 9995086 | Center-pillared full-face shaft drilling machine | Dec 09, 14 | Jun 12, 18 | Not available |
| 9995138 | Device for sinking a shaft and method for sinking a shaft | Jun 02, 14 | Jun 12, 18 | HERRENKNECHT AKTIENGESELLSCHAFT |
| 9144921 | Method for wire saw excavation | Feb 27, 15 | Sep 29, 15 | KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS |
| 8905486 | Underground mining | Jun 30, 10 | Dec 09, 14 | TECHNOLOGICAL RESOURCES PTY. LIMITED |
| 8887833 | Reamer assembly | Aug 22, 11 | Nov 18, 14 | EARTH TOOL COMPANY, LLC |
| 8757731 | Method for introducing a vertical shaft and shaft driving machine | Jun 14, 13 | Jun 24, 14 | Herrenknecht AG |
| 7891439 | Method of multistage manufacturing a ground bore | Mar 28, 08 | Feb 22, 11 | TRACTO-TECHNIK GMBH & CO. KG |
| 7699123 | Bore hole sleeve reaming apparatus and method | May 28, 08 | Apr 20, 10 | Not available |
| 7617888 | Pilot tube system and attachment mechanism for auger boring machine | Mar 07, 07 | Nov 17, 09 | Not available |
| 7389829 | Method and apparatus for forming bored hole | May 20, 03 | Jun 24, 08 | DIMITROFF, TED R. |
| 7137460 | Back reaming tool | Mar 17, 04 | Nov 21, 06 | SANDVIK INTELLECTUAL PROPERTY AB |
| 7128168 | Reamer apparatus for ground boring machine | Mar 24, 04 | Oct 31, 06 | KOMATSU LTD. |
| 6953306 | Method of accurate trenchless installation of underground pipe | Jan 27, 04 | Oct 11, 05 | INA ACQUISITION CORP., INSITUFORM (NETHERLANDS) B.V., |
| 6682264 | Method of accurate trenchless installation of underground pipe | Feb 26, 02 | Jan 27, 04 | INA ACQUISITION CORP. |
| 5931601 | Tunnel excavator | Sep 19, 97 | Aug 03, 99 | KOMATSU LTD. |
| 5873676 | Coring rod support wheel | Feb 05, 97 | Feb 23, 99 | ATKINS UNDERGROUND L.P. |
| 5628585 | Method and apparatus for removal of utility line and replacement with polyolefin pipe | Apr 28, 95 | May 13, 97 | EPI ENVIRONMENTAL TECHNOLOGIES INC. |
| 5125768 | Method and apparatus for the production of underground pipelines | Oct 19, 90 | Jun 30, 92 | Not available |
| 5096002 | Method and apparatus for enlarging an underground path | Jul 26, 90 | Mar 17, 92 | Cherrington Corporation |
| 5022789 | Method and machine for constructing shafts | Nov 17, 88 | Jun 11, 91 | Shimizu Construction Co., Ltd. |