E21D 9/13
Using hydraulic or pneumatic conveying means
Official title: using hydraulic or pneumatic conveying means
E21D9/13 (Using hydraulic or pneumatic conveying means) appears on 36 US grants and 18 published applications in this corpus.
Search patents in E21D- Granted patents
- 36
- Published applications
- 18
- Assignees
- 29
- Inventors
- 76
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 2 |
| 2004 | 0 | 1 |
| 2005 | 0 | 3 |
| 2006 | 3 | 0 |
| 2007 | 1 | 1 |
| 2008 | 2 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 3 |
| 2020 | 1 | 0 |
| 2021 | 2 | 0 |
| 2022 | 0 | 2 |
| 2023 | 2 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Drill head for creating a borehole in the ground4 Nov 2025US 12,460,487 B2Herrenknecht AG
- CRS: quick connector for tunnel boring machine spoil check12 Dec 2023US 11,841,102 B2Bouygues Travaux Publics
- Tunnel boring system28 Feb 2023US 11,591,909 B2EarthGrid PBC
- Tunnel boring system5 Oct 2021US 11,136,886 B1EarthGrid PBC
- Tunnel boring device and system for the hydraulic removal of cuttings, and system for producing a stable fluid pressure for a boring fluid in the region of a cutting disk of the tunnel boring device14 Sep 2021US 11,118,454 B2Herrenknecht AG
- Drill head for creating a borehole in the ground27 Jun 2024US 2024/0209699 A1Herrenknecht AG
- Plasma Drilling System29 Jun 2023US 2023/0203948 A1EarthGrid PBC
- Crs: quick connector for tunnel boring machine spoil check1 Sep 2022US 2022/0275893 A1Bouygues Travaux Publics
- Tunnel Boring System14 Jul 2022US 2022/0220851 A1EarthGrid PBC
- Tunnel boring machine29 Aug 2019US 2019/0264563 A1Xcmg-Kaigong Heavy Industry Nanjing Co., Ltd
Most cited
By later US patents
- Method and means for recovering hydrocarbons from oil sands by underground mining24US 7,192,092 B2Oil Sands Underground Mining, Inc. · 2007
- Shield tunneling method and machine therefor21US 4,406,498 AKabushiki Kaisha Iseki Kaihatsu Koki · 1983
- Method and means for processing oil sands while excavating21US 7,097,255 B2Oil Sands Underground Mining, Inc. · 2006
- Method and means for processing oil sands while excavating18US 7,448,692 B2Osum Oil Sands Corp. · 2008
- Method and means for recovering hydrocarbons from oil sands by underground mining17US 7,128,375 B2Oil Stands Underground Mining Corp. · 2006