E21D 9/112
By means of one single rotary head or of concentric rotary heads
Official title: {by means of one single rotary head or of concentric rotary heads (E21D9/111 takes precedence)}
E21D9/112 (By means of one single rotary head or of concentric rotary heads) appears on 84 US grants and 61 published applications in this corpus.
Search patents in E21D- Granted patents
- 84
- Published applications
- 61
- Assignees
- 54
- Inventors
- 214
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 2 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 4 |
| 2013 | 3 | 3 |
| 2014 | 2 | 4 |
| 2015 | 6 | 4 |
| 2016 | 3 | 4 |
| 2017 | 2 | 4 |
| 2018 | 5 | 3 |
| 2019 | 3 | 1 |
| 2020 | 4 | 2 |
| 2021 | 1 | 6 |
| 2022 | 4 | 3 |
| 2023 | 2 | 5 |
| 2024 | 6 | 5 |
| 2025 | 7 | 3 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Tunnel boring machine and method for tunneling using a tunnel boring machine29 Sep 2026US 12,747,665 B2Herrenknecht AG
- Tunnel excavation apparatus to which spectroscopic analysis method is applied16 Jun 2026US 12,655,760 B2Korea Radioactive Waste Agency
- Method, arrangement and machine for full face reaming24 Feb 2026US 12,560,087 B2Bergteamet AB
- Tunnel boring machine equipped with high-pressure water jet cutting system and combined tunneling method27 Jan 2026US 12,535,004 B2Shandong University
- Tunnel excavation device7 Oct 2025US 12,435,629 B2Komatsu Ltd.
- A pipe jacking machine7 May 2026US 2026/0126131 A1Hk Ck Development Limited
- Tunnel boring machine for excavating semicircular-arched tunnels1 Jan 2026US 2026/0002445 A1Robbins Mining, Inc.
- Tunnel boring machine equipped with high-pressure water jet cutting system and combined tunneling method16 Oct 2025US 2025/0320818 A1Shandong University
- Tunnel excavation apparatus to which spectroscopic analysis method is applied22 May 2025US 2025/0163805 A1Korea Radioactive Waste Agency
- Rotary digging drill and amphibious tunnel construction robot using same3 Apr 2025US 2025/0109689 A1Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
Most cited
By later US patents
- Automatic control system and method for a machine used for excavating drifts, tunnels, stopes, or caverns43US 5,938,288 AHDRK Mining Research Limited · 1999
- Tunnel boring machine26US 4,494,799 AHarrison Western Corporation · 1985
- Shield-type tunneling machine with toggle controlled bit plates in cutter disc20US 4,311,344 AKabushiki Kaisha Iseki Kaihatsu Koki · 1982
- Tunnel boring machine19US 4,637,657 AHarrison Western Corporation · 1987
- Tunneling machine for boring a side drift18US 3,963,080 ADresser Industries, Inc. · 1976