E21B 1/12
Percussion drilling: with a reciprocating impulse member
Official title: with a reciprocating impulse member (E21B1/02, E21B1/38 take precedence)
E21B1/12 (Percussion drilling: with a reciprocating impulse member) appears on 85 US grants and 81 published applications in this corpus.
Search patents in E21B- Granted patents
- 85
- Published applications
- 81
- Assignees
- 56
- Inventors
- 177
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 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 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 3 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 1 | 0 |
| 2008 | 2 | 2 |
| 2009 | 1 | 3 |
| 2010 | 0 | 1 |
| 2011 | 3 | 2 |
| 2012 | 1 | 0 |
| 2013 | 1 | 2 |
| 2014 | 2 | 1 |
| 2015 | 1 | 4 |
| 2016 | 3 | 5 |
| 2017 | 2 | 4 |
| 2018 | 4 | 2 |
| 2019 | 2 | 4 |
| 2020 | 3 | 3 |
| 2021 | 3 | 4 |
| 2022 | 6 | 7 |
| 2023 | 7 | 8 |
| 2024 | 8 | 18 |
| 2025 | 14 | 4 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydraulic impact mechanism for use in equipment for processing rock and concrete16 Jun 2026US 12,655,687 B2T-Rig Limited
- Down-the-hole hammer with ported piston and flow control valve21 Apr 2026US 12,607,069 B2Caterpillar Inc.
- Drilling system for recovering nearly undisturbed cores from loose to solid ground13 Jan 2026US 12,523,106 B2Stumatec AG
- Valve-controlled high-energy hydrostatic down-the-hole impact hammer23 Dec 2025US 12,503,915 B2Southwest Petroleum University
- Arrangement and method for heating hydraulic impact device25 Nov 2025US 12,480,364 B2Sandvik Mining and Construction Oy
- Hydraulic Hammering Device7 May 2026US 2026/0125951 A1Furukawa Rock Drill Co., Ltd.
- Earth Drilling Device16 Oct 2025US 2025/0320780 A1TRACTO-TECHNIK GmbH & Co. KG
- Multi-Tool Boring Systems and Methods of Operating Such Systems9 Oct 2025US 2025/0314132 A1Phoenix Boring, Inc.
- Hydraulic impact mechanism for use in equipment for processing rock and concrete27 Mar 2025US 2025/0101807 A1T-Rig Limited
- Valve cylinder, impact device and method23 Jan 2025US 2025/0027368 A1Sandvik Mining and Construction Oy
Most cited
By later US patents
- Electromagnetic percussion appliance23US 4,215,297 A1980
- Percussive tool12US 4,690,225 AInstitut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR · 1987
- Damping device for a percussion rock drilling machine12US 4,871,035 AAtlas Copco Aktiebolag · 1989
- Drilling process monitor11US 6,637,523 B2The University of Hong Kong · 2003
- Hammer drill10US 4,690,226 AMetabowerke GmbH · 1987