E21B 23/0418
Specially adapted for locking the tools in landing nipples or recesses
Official title: {specially adapted for locking the tools in landing nipples or recesses}
E21B23/0418 (Specially adapted for locking the tools in landing nipples or recesses) appears on 82 US grants and 43 published applications in this corpus.
Search patents in E21B- Granted patents
- 82
- Published applications
- 43
- Assignees
- 37
- Inventors
- 114
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 6 | 1 |
| 2002 | 10 | 7 |
| 2003 | 1 | 2 |
| 2004 | 1 | 4 |
| 2005 | 3 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 3 |
| 2011 | 1 | 3 |
| 2012 | 2 | 1 |
| 2013 | 0 | 2 |
| 2014 | 2 | 2 |
| 2015 | 2 | 0 |
| 2016 | 2 | 1 |
| 2017 | 2 | 5 |
| 2018 | 2 | 0 |
| 2019 | 1 | 1 |
| 2020 | 2 | 3 |
| 2021 | 2 | 2 |
| 2022 | 2 | 3 |
| 2023 | 2 | 0 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Production selective landing tool2 Dec 2025US 12,486,728 B2Schlumberger Technology Corporation
- Method for counting restrictions in a subterranean wellbore3 Sep 2024US 12,078,045 B1Weatherford Technology Holdings, LLC
- Driving system for core drilling rig20 Feb 2024US 11,905,775 B2Shenzhen University
- Coring drill tool driving structure3 Oct 2023US 11,773,673 B2Shenzhen University
- Stinger for actuating surface-controlled subsurface safety valve14 Feb 2023US 11,578,561 B2Weatherford Technology Holdings, LLC
- Production selective landing tool27 Feb 2025US 2025/0067139 A1Schlumberger Technology Corporation
- Method for counting restrictions in a subterranean wellbore5 Sep 2024US 2024/0295166 A1Weatherford Technology Holdings, LLC
- Driving system for core drilling rig7 Jul 2022US 2022/0213745 A1Shenzhen University
- Coring drill tool driving structure7 Jul 2022US 2022/0213746 A1Shenzhen University
- Stinger for Actuating Surface-Controlled Subsurface Safety Valve7 Apr 2022US 2022/0106858 A1Weatherford Technology Holdings, LLC
Most cited
By later US patents
- Drilling with casing and retrievable bit-motor assembly249US 5,472,057 AAtlantic Richfield Company · 1995
- Downhole running tool136US 6,050,341 APetroline Wellsystems Limited · 2000
- Method of performing downhole functions110US 6,354,374 B1Schlumberger Technology Corporation · 2002
- Sand removal and device retrieval tool107US 6,427,776 B1Weatherford/Lamb, Inc. · 2002
- Method and apparatus for drilling and re-entering multiple lateral branched in a well81US 6,012,527 ASchlumberger Technology Corporation · 2000