E21D 9/1073
Applying thermal energy
Official title: {applying thermal energy, e.g. by projecting flames or hot gases, by laser beams (flame drilling E21B7/14)}
E21D9/1073 (Applying thermal energy) appears on 26 US grants and 32 published applications in this corpus.
Search patents in E21D- Granted patents
- 26
- Published applications
- 32
- Assignees
- 14
- Inventors
- 69
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 1 | 1 |
| 2017 | 2 | 0 |
| 2018 | 0 | 0 |
| 2019 | 2 | 4 |
| 2020 | 2 | 1 |
| 2021 | 2 | 3 |
| 2022 | 2 | 7 |
| 2023 | 6 | 7 |
| 2024 | 3 | 1 |
| 2025 | 3 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High power laser tunneling mining and construction equipment and methods of use25 Aug 2026US 12,715,063 B2Foro Energy, Inc.
- Hybrid tunnel boring using combination of thermal and mechanical processes14 Jul 2026US 12,680,450 B2Phoenix Boring, Inc.
- TBM tunneling test bench for microwave-assisted rotary rock breaking24 Jun 2025US 12,339,199 B2China Railway Tunnel Group Co., Ltd.
- Microwave-based mining systems and methods with robotic arm waveguide18 Mar 2025US 12,252,988 B2Off-World, Inc.
- Systems and methods for non-contact boring14 Jan 2025US 12,196,082 B2Phoenix Boring, Inc.
- Hybrid Tunnel Boring Using Combination of Thermal and Mechanical Processes1 Oct 2026US 2026/0298086 A1Phoenix Boring, Inc.
- Microwave-based mining systems and methods with robotic arm waveguide12 Mar 2026US 2026/0071543 A1Off-World, Inc.
- Hybrid Tunnel Boring Using Combination of Thermal and Mechanical Processes11 Dec 2025US 2025/0376926 A1Phoenix Boring, Inc.
- Microwave energy applicator23 Oct 2025US 2025/0327403 A1Off-World, Inc.
- Systems And Methods For Non-Contact Boring27 Feb 2025US 2025/0067176 A1Phoenix Boring, Inc.
Most cited
By later US patents
- Tunneling for underground power and pipelines7US 10,584,585 B2ArcByt, Inc. · 2020
- Systems and methods for non-contact boring7US 11,492,904 B2ArcByt, Inc. · 2022
- Method and device for producing underground cavities using a driving shield5US 4,260,194 AMesserschmitt-Bolkow-Blohm GmbH · 1981
- Cutter head for microwave presplitting type hard-rock tunnel boring machine4US 10,428,654 B2Northeastern University · 2019
- High power laser tunneling mining and construction equipment and methods of use3US 10,195,687 B2Foro Energy, Inc. · 2019