E21B 23/0413
Using means for blocking fluid flow
Official title: {using means for blocking fluid flow, e.g. drop balls or darts (using balls or the like for actuating downhole valves E21B34/142)}
E21B23/0413 (Using means for blocking fluid flow) appears on 185 US grants and 194 published applications in this corpus.
Search patents in E21B- Granted patents
- 185
- Published applications
- 194
- Assignees
- 92
- Inventors
- 413
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 2 |
| 2005 | 2 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 2 | 3 |
| 2009 | 3 | 1 |
| 2010 | 1 | 8 |
| 2011 | 1 | 3 |
| 2012 | 3 | 8 |
| 2013 | 5 | 3 |
| 2014 | 2 | 6 |
| 2015 | 7 | 9 |
| 2016 | 4 | 9 |
| 2017 | 7 | 6 |
| 2018 | 8 | 3 |
| 2019 | 8 | 2 |
| 2020 | 3 | 21 |
| 2021 | 10 | 16 |
| 2022 | 24 | 32 |
| 2023 | 22 | 27 |
| 2024 | 22 | 13 |
| 2025 | 21 | 14 |
| 2026 | 10 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydraulic lock apparatus8 Sep 2026US 12,729,603 B2Welleng Science and Technology Ltd.
- Unlimited stage completion system25 Aug 2026US 12,716,314 B2Packers Plus Energy Service, Inc.
- Sub-surface release plug with pressure bypass25 Aug 2026US 12,716,323 B2Weatherford Technology Holdings, LLC
- Systems and methods for activating a pressure-sensitive downhole tool18 Aug 2026US 12,709,953 B2Robertson Intellectual Properties, LLC
- Wireline logging in horizontal wells21 Jul 2026US 12,687,105 B2Saudi Arabian Oil Company
- Plug Breaker18 Jun 2026US 2026/0168343 A1TCO Group AS
- Sub-surface release plug with pressure bypass18 Jun 2026US 2026/0168349 A1Weatherford Technology Holdings, LLC
- Full-bore cementing and fracturing sliding sleeve system11 Jun 2026US 2026/0160150 A1Sichuan Pangolin Petroleum Technology Co., Ltd.
- Ball-activated flapper valve for downhole float equipment12 Mar 2026US 2026/0071508 A1Innovex International, Inc.
- Activator, tools, and method25 Dec 2025US 2025/0389163 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Retractable ball seat having a time delay material146US 7,464,764 B2Baker Hughes Incorporated · 2008
- Drop ball sub and system of use145US 6,390,200 B1Allamon Interest · 2002
- Drop ball sub and system of use119US 6,467,546 B22002
- Downhole adjustable stabilizer116US 5,293,945 ABaroid Technology, Inc. · 1994
- Dissolvable tool and method110US 8,403,037 B2Baker Hughes Incorporated · 2013