E21B 6/04
Separate drives for percussion and rotation
E21B6/04 (Separate drives for percussion and rotation) appears on 54 US grants and 67 published applications in this corpus.
Search patents in E21B- Granted patents
- 54
- Published applications
- 67
- Assignees
- 38
- Inventors
- 113
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 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 | 2 | 0 |
| 2002 | 1 | 4 |
| 2003 | 1 | 0 |
| 2004 | 2 | 2 |
| 2005 | 2 | 2 |
| 2006 | 1 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 2 |
| 2013 | 0 | 2 |
| 2014 | 1 | 4 |
| 2015 | 4 | 2 |
| 2016 | 2 | 1 |
| 2017 | 3 | 4 |
| 2018 | 1 | 7 |
| 2019 | 6 | 6 |
| 2020 | 5 | 4 |
| 2021 | 4 | 4 |
| 2022 | 4 | 3 |
| 2023 | 3 | 3 |
| 2024 | 3 | 5 |
| 2025 | 4 | 6 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Air motor assembly20 Nov 2025US 2025/0354482 A1Directional Air Drilling International, LLC
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- Air motor assembly25 Sep 2025US 2025/0297520 A1Bluegrass Drilling Technologies, LLC
Most cited
By later US patents
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- Reverse circulation drilling system with bit locked underreamer arms10US 6,394,197 B12002
- Rock drill10US 6,854,538 B2Sandvik Tamrock Oy · 2005