E21B 31/18
Gripping externally
Official title: gripping externally, e.g. overshot
E21B31/18 (Gripping externally) appears on 229 US grants and 156 published applications in this corpus.
Search patents in E21B- Granted patents
- 229
- Published applications
- 156
- Assignees
- 107
- Inventors
- 389
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 5 | 0 |
| 1988 | 0 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 4 |
| 2002 | 5 | 1 |
| 2003 | 3 | 1 |
| 2004 | 1 | 7 |
| 2005 | 3 | 2 |
| 2006 | 4 | 1 |
| 2007 | 2 | 2 |
| 2008 | 2 | 4 |
| 2009 | 3 | 8 |
| 2010 | 1 | 1 |
| 2011 | 4 | 4 |
| 2012 | 2 | 7 |
| 2013 | 4 | 6 |
| 2014 | 10 | 9 |
| 2015 | 10 | 4 |
| 2016 | 5 | 7 |
| 2017 | 5 | 9 |
| 2018 | 9 | 11 |
| 2019 | 9 | 6 |
| 2020 | 13 | 8 |
| 2021 | 11 | 10 |
| 2022 | 11 | 13 |
| 2023 | 9 | 10 |
| 2024 | 9 | 11 |
| 2025 | 7 | 7 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydraulic actuated tool catcher25 Aug 2026US 12,716,329 B2Schlumberger Technology Corporation
- Retrieval device with locking feature16 Jun 2026US 12,654,338 B1
- Fishing tool with electric release27 Jan 2026US RE50,763 E1Autentik AS
- Well intervention tool and method for clearing tubes and lines20 Jan 2026US 12,529,276 B2Axter
- Universal fishing tool and method of removing a fish from a wellbore20 Jan 2026US 12,529,278 B2Saudi Arabian Oil Company
- Downhole tool23 Jul 2026US 2026/0210200 A1Welltec A/S
- Tool configured to engage an object25 Jun 2026US 2026/0176930 A1Schlumberger Technology Corporation
- Hydraulic actuated tool catcher4 Jun 2026US 2026/0153012 A1Schlumberger Technology Corporation
- Sacrificial tool for plugging and abandoning a wellbore and methods thereof11 Dec 2025US 2025/0376910 A1Saudi Arabian Oil Company
- Universal fishing tool and method of removing a fish from a wellbore30 Oct 2025US 2025/0334014 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation155US 6,343,649 B12002
- Self-driving and self-locking device for traversing channels and elongated structures140US 4,085,808 A1978
- Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation137US 6,359,569 B2Halliburton Energy Services.Inc. · 2002
- Apparatus and method for retrieving and/or communicating with downhole equipment116US 5,278,550 ASchlumberger Technology Corporation · 1994
- Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation99US 6,497,280 B2Halliburton Energy Services.Inc. · 2002