E21B 4/14
Fluid operated hammers
E21B4/14 (Fluid operated hammers) appears on 659 US grants and 349 published applications in this corpus.
Search patents in E21B- Granted patents
- 659
- Published applications
- 349
- Assignees
- 237
- Inventors
- 701
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 10 | 0 |
| 1978 | 13 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 10 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 8 | 0 |
| 1986 | 10 | 0 |
| 1987 | 16 | 0 |
| 1988 | 9 | 0 |
| 1989 | 22 | 0 |
| 1990 | 20 | 0 |
| 1991 | 12 | 0 |
| 1992 | 27 | 0 |
| 1993 | 13 | 0 |
| 1994 | 18 | 0 |
| 1995 | 12 | 0 |
| 1996 | 15 | 0 |
| 1997 | 7 | 0 |
| 1998 | 11 | 0 |
| 1999 | 14 | 0 |
| 2000 | 17 | 0 |
| 2001 | 10 | 3 |
| 2002 | 16 | 8 |
| 2003 | 12 | 10 |
| 2004 | 9 | 15 |
| 2005 | 6 | 9 |
| 2006 | 12 | 4 |
| 2007 | 6 | 16 |
| 2008 | 11 | 18 |
| 2009 | 8 | 20 |
| 2010 | 15 | 21 |
| 2011 | 16 | 18 |
| 2012 | 20 | 15 |
| 2013 | 5 | 13 |
| 2014 | 15 | 17 |
| 2015 | 18 | 18 |
| 2016 | 18 | 17 |
| 2017 | 11 | 11 |
| 2018 | 18 | 16 |
| 2019 | 16 | 6 |
| 2020 | 10 | 18 |
| 2021 | 17 | 8 |
| 2022 | 13 | 24 |
| 2023 | 19 | 15 |
| 2024 | 20 | 15 |
| 2025 | 15 | 12 |
| 2026 | 8 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Down-the-hole drill hammer having a piston follower valve1 Sep 2026US 12,723,469 B2Center Rock Inc.
- Hybrid hydraulic down-the-hole hammer14 Jul 2026US 12,680,386 B2Mincon International Limited
- Hydraulic down-the-hole hammer and subsea pile23 Jun 2026US 12,662,880 B2Mincon International Limited
- Down-the-hole hammer with adjustable air consumption valve28 Apr 2026US 12,612,823 B2Caterpillar Inc.
- Down-the-hole hammer with ported piston and flow control valve21 Apr 2026US 12,607,069 B2Caterpillar Inc.
- Drill string apparatus11 Jun 2026US 2026/0160132 A1
- Hybrid hydraulic down-the-hole hammer5 Feb 2026US 2026/0035997 A1Mincon International Limited
- Air motor assembly20 Nov 2025US 2025/0354482 A1Directional Air Drilling International, LLC
- Drilling assembly6 Nov 2025US 2025/0341132 A1BAUER Spezialtiefbau GmbH
- Hydraulic down-the-hole hammer and subsea pile30 Oct 2025US 2025/0333921 A1Mincon International Limited
Most cited
By later US patents
- Fluid operated vibratory jar with rotating bit155US 5,156,223 A1992
- Fluid operated vibratory jar with rotating bit128US 4,958,691 A1990
- Percussion drill assembly128US 5,662,180 ADresser-Rand Company · 1997
- Fluid operated vibratory oil well drilling tool119US 6,062,324 ABaker Hughes Incorporated · 2000
- Fluid operated vibratory oil well drilling tool with anti-chatter switch107US 6,035,954 ABaker Hughes Incorporated · 2000