E21B 41/0021
Safety devices
Official title: {Safety devices, e.g. for preventing small objects from falling into the borehole}
E21B41/0021 (Safety devices) appears on 298 US grants and 339 published applications in this corpus.
Search patents in E21B- Granted patents
- 298
- Published applications
- 339
- Assignees
- 190
- Inventors
- 649
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 5 | 6 |
| 2003 | 1 | 3 |
| 2004 | 4 | 11 |
| 2005 | 4 | 10 |
| 2006 | 6 | 4 |
| 2007 | 5 | 4 |
| 2008 | 8 | 9 |
| 2009 | 4 | 6 |
| 2010 | 4 | 6 |
| 2011 | 8 | 7 |
| 2012 | 3 | 12 |
| 2013 | 6 | 20 |
| 2014 | 10 | 18 |
| 2015 | 16 | 17 |
| 2016 | 17 | 18 |
| 2017 | 20 | 27 |
| 2018 | 17 | 20 |
| 2019 | 16 | 21 |
| 2020 | 17 | 27 |
| 2021 | 29 | 21 |
| 2022 | 11 | 18 |
| 2023 | 14 | 21 |
| 2024 | 17 | 11 |
| 2025 | 12 | 10 |
| 2026 | 5 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Drilling system and method of operating a drilling system29 Sep 2026US 12,747,644 B2Mhwirth AS
- System for detecting an entity in the vicinity of a drilling machine, and corresponding method25 Aug 2026US 12,715,740 B2Mbi Produits De Forage Inc.
- Well integrity system and method25 Aug 2026US 12,716,330 B2Ads Services, LLC
- Rotary multi tool5 May 2026US 12,618,306 B2Transocean Sedco Forex Ventures Limited
- Fluid coupling and sleeve therefor13 Jan 2026US 12,523,333 B2Eaton Intelligent Power Limited
- Hose containment system10 Sep 2026US 2026/0266410 A1FLX Energy Services, Inc.
- Link-tilt adaptor with one or more shear pins6 Aug 2026US 2026/0226803 A1Parker Drilling Company
- Device, system and method for removal of cable clamps from a pipe string30 Jul 2026US 2026/0218581 A1Odfjell Technology Invest Ltd
- Apparatus for drilling and positioning a collar support sleeve into a blast hole16 Jul 2026US 2026/0201778 A1
- Drilling system and method of operating a drilling system9 Jul 2026US 2026/0193945 A1Mhwirth AS
Most cited
By later US patents
- Safety indicator lights for hydraulic fracturing pumps272US 9,650,871 B2U.S. Well Services, LLC · 2017
- Apparatus and methods for tubular makeup interlock159US 6,742,596 B2Weatherford/Lamb, Inc. · 2004
- Secure activation of a downhole device115US 7,347,278 B2Schlumberger Technology Corporation · 2008
- Self-propelled drilling module111US 5,248,005 ANabors Industries, Inc. · 1993
- Lightweight intervention system100US 6,053,252 AExpro North Sea Limited · 2000