E21D 9/104
Cutting tool fixtures
Official title: {Cutting tool fixtures (devices with percussive tools E21D9/106)}
E21D9/104 (Cutting tool fixtures) appears on 98 US grants and 63 published applications in this corpus.
Search patents in E21D- Granted patents
- 98
- Published applications
- 63
- Assignees
- 60
- Inventors
- 189
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 2 |
| 2008 | 2 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 6 |
| 2015 | 4 | 1 |
| 2016 | 1 | 3 |
| 2017 | 3 | 7 |
| 2018 | 3 | 7 |
| 2019 | 7 | 4 |
| 2020 | 8 | 8 |
| 2021 | 5 | 2 |
| 2022 | 2 | 6 |
| 2023 | 3 | 1 |
| 2024 | 4 | 2 |
| 2025 | 1 | 1 |
| 2026 | 4 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Performance monitoring system for disc cutter of tunnel boring machine4 Aug 2026US 12,698,710 B2NK Photonics Ltd.
- Hybrid tunnel boring using combination of thermal and mechanical processes14 Jul 2026US 12,680,450 B2Phoenix Boring, Inc.
- Rolling wedge cutter drum30 Jun 2026US 12,668,933 B1
- Cutting-ring assembly13 Jan 2026US 12,523,149 B2Aktiebolaget Skf
- Cutting apparatus4 Nov 2025US 12,460,545 B2Sandvik Mining and Construction Oy
- Rolling Wedge Cutter Drum1 Oct 2026US 2026/0297869 A1
- Hybrid Tunnel Boring Using Combination of Thermal and Mechanical Processes1 Oct 2026US 2026/0298086 A1Phoenix Boring, Inc.
- Excited-vibration disc-cutting rock-breaking device of front eccentric block3 Sep 2026US 2026/0258726 A1Taiyuan University of Science and Technology
- Tunnel boring machine12 Feb 2026US 2026/0043331 A1Herrenknecht AG
- Hybrid Tunnel Boring Using Combination of Thermal and Mechanical Processes11 Dec 2025US 2025/0376926 A1Phoenix Boring, Inc.
Most cited
By later US patents
- Cutting device with rotating disc43US 6,561,590 B2Odyssey Technology Pty Ltd · 2003
- Replaceable multiple TCI kerf ring38US 6,367,569 B1Baker Hughes Incorporated · 2002
- Shielded cutterhead with small rolling disc cutters35US 5,961,185 AExcavation Engineering Associates, Inc. · 1999
- Rock boring device with an oscillating and nutating rotary disc cutter33US 7,182,407 B1Odyssey Technology Pty Ltd · 2007
- Earth-boring bit having cutter with replaceable kerf ring with contoured inserts32US 5,785,135 ABaker Hughes Incorporated · 1998