E21B 10/38
Characterised by conduits or nozzles for drilling fluids
Official title: characterised by conduits or nozzles for drilling fluids
E21B10/38 (Characterised by conduits or nozzles for drilling fluids) appears on 207 US grants and 98 published applications in this corpus.
Search patents in E21B- Granted patents
- 207
- Published applications
- 98
- Assignees
- 102
- Inventors
- 327
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 4 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 9 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 9 | 0 |
| 1989 | 4 | 0 |
| 1990 | 5 | 0 |
| 1991 | 8 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 3 |
| 2003 | 2 | 1 |
| 2004 | 4 | 7 |
| 2005 | 4 | 1 |
| 2006 | 3 | 2 |
| 2007 | 3 | 4 |
| 2008 | 4 | 9 |
| 2009 | 2 | 3 |
| 2010 | 6 | 3 |
| 2011 | 2 | 5 |
| 2012 | 1 | 3 |
| 2013 | 3 | 3 |
| 2014 | 4 | 7 |
| 2015 | 3 | 1 |
| 2016 | 3 | 7 |
| 2017 | 3 | 3 |
| 2018 | 3 | 7 |
| 2019 | 8 | 4 |
| 2020 | 6 | 6 |
| 2021 | 9 | 4 |
| 2022 | 1 | 4 |
| 2023 | 3 | 1 |
| 2024 | 8 | 5 |
| 2025 | 3 | 3 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Jetting system for drilling operations8 Sep 2026US 12,729,588 B1Saudi Arabian Oil Company
- Drill bit assembly for reverse circulation hammer2 Jun 2026US 12,644,338 B2Mincon International Limited
- Earth-drilling tool21 Apr 2026US 12,607,071 B2Kennametal India Limited
- Method and apparatus for removing debris from a drill hole during drilling1 Jul 2025US 12,345,106 B2
- Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels29 Apr 2025US 12,286,850 B2Haozhou Drilling Engineering Machinery (Shandong) Co., Ltd.
- Fully sealed down the hole hammer16 Jul 2026US 2026/0201760 A1Sandvik Mining and Construction Oy
- Drill bit assembly for reverse circulation hammer7 Aug 2025US 2025/0250862 A1Mincon International Limited
- Percussive Drill Bit3 Jul 2025US 2025/0215752 A1Boart Longyear Manufacturing And Distribution Inc.
- Earth-drilling tool1 May 2025US 2025/0137328 A1Kennametal India Limited
- Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent hannels23 May 2024US 2024/0167341 A1Haozhou Drilling Engineering Machinery (Shandong) Co., Ltd.
Most cited
By later US patents
- Earth drilling knobby bit105US 4,096,917 A1978
- Percussion drill bit99US 3,955,635 A1976
- Drill apparatus having a primary drill and a pilot drill98US 4,852,672 A1989
- Down hole hammer assembly87US 6,035,953 A2000
- Percussion drill bit having centrally projecting insert85US 4,304,312 ASandvik Aktiebolag · 1981