E21B 34/102
With means for locking the closing element in open or closed position
Official title: {with means for locking the closing element in open or closed position (E21B34/105 and E21B34/108 take precedence)}
E21B34/102 (With means for locking the closing element in open or closed position) appears on 704 US grants and 541 published applications in this corpus.
Search patents in E21B- Granted patents
- 704
- Published applications
- 541
- Assignees
- 188
- Inventors
- 917
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 11 | 0 |
| 1983 | 7 | 0 |
| 1984 | 8 | 0 |
| 1985 | 5 | 0 |
| 1986 | 14 | 0 |
| 1987 | 12 | 0 |
| 1988 | 7 | 0 |
| 1989 | 10 | 0 |
| 1990 | 10 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 8 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 7 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 12 | 0 |
| 2001 | 14 | 7 |
| 2002 | 10 | 13 |
| 2003 | 8 | 8 |
| 2004 | 11 | 9 |
| 2005 | 6 | 8 |
| 2006 | 6 | 6 |
| 2007 | 8 | 8 |
| 2008 | 7 | 13 |
| 2009 | 10 | 14 |
| 2010 | 12 | 6 |
| 2011 | 14 | 19 |
| 2012 | 14 | 30 |
| 2013 | 7 | 32 |
| 2014 | 27 | 39 |
| 2015 | 27 | 36 |
| 2016 | 46 | 39 |
| 2017 | 20 | 34 |
| 2018 | 41 | 34 |
| 2019 | 56 | 31 |
| 2020 | 36 | 32 |
| 2021 | 29 | 35 |
| 2022 | 38 | 24 |
| 2023 | 28 | 29 |
| 2024 | 29 | 12 |
| 2025 | 15 | 12 |
| 2026 | 12 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Convertible autofill float equipment having poppet valve and interlock15 Sep 2026US 12,735,956 B2Weatherford Technology Holdings, LLC
- Hydraulic lock apparatus8 Sep 2026US 12,729,603 B2Welleng Science and Technology Ltd.
- Sand screen joint with producible check ball11 Aug 2026US 12,704,041 B2Halliburton Energy Services.Inc.
- Biasing piston based equiflow ROV for preventing well kick off issue4 Aug 2026US 12,698,693 B2Halliburton Energy Services.Inc.
- Plug breaker14 Jul 2026US 12,680,405 B2TCO Group AS
- Bi-directional Running Tool for Expandable Liner Hanger8 Oct 2026US 2026/0309007 A1Halliburton Energy Services.Inc.
- Convertible Autofill Float Equipment Having Poppet Valve and Interlock10 Sep 2026US 2026/0266160 A1Weatherford International, Inc.
- Flapper type pump out pplug10 Sep 2026US 2026/0266161 A1
- Tubing or casing conveyed fluid sampling system6 Aug 2026US 2026/0226816 A1Halliburton Energy Services.Inc.
- Sand screen joint with producible check ball16 Jul 2026US 2026/0201774 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Temporary plug system266US 5,479,986 AHalliburton Company · 1996
- Method and apparatus for providing controlled force transference to a wellbore tool200US 5,343,963 A1994
- Casing shoes and methods of reverse-circulation cementing of casing172US 7,322,412 B2Halliburton Energy Services.Inc. · 2008
- Sand control screen assembly and treatment method using the same152US 7,096,945 B2Halliburton Energy Services.Inc. · 2006
- Bidirectional disappearing plug146US 5,765,641 AHalliburton Energy Services.Inc. · 1998