E21B 34/025
Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid
Official title: {Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid flow}
E21B34/025 (Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid) appears on 404 US grants and 393 published applications in this corpus.
Search patents in E21B- Granted patents
- 404
- Published applications
- 393
- Assignees
- 163
- Inventors
- 627
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 8 | 2 |
| 2002 | 3 | 3 |
| 2003 | 5 | 8 |
| 2004 | 3 | 9 |
| 2005 | 8 | 4 |
| 2006 | 5 | 6 |
| 2007 | 6 | 7 |
| 2008 | 2 | 5 |
| 2009 | 2 | 6 |
| 2010 | 4 | 8 |
| 2011 | 4 | 6 |
| 2012 | 6 | 15 |
| 2013 | 12 | 8 |
| 2014 | 9 | 17 |
| 2015 | 8 | 24 |
| 2016 | 15 | 21 |
| 2017 | 19 | 19 |
| 2018 | 20 | 15 |
| 2019 | 25 | 20 |
| 2020 | 14 | 23 |
| 2021 | 21 | 22 |
| 2022 | 33 | 37 |
| 2023 | 32 | 39 |
| 2024 | 37 | 33 |
| 2025 | 31 | 17 |
| 2026 | 14 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Pressure response test to detect leakage of rotating control device24 Sep 2026US 2026/0286841 A1Schlumberger Technology Corporation
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Most cited
By later US patents
- Subsea hydraulic choke193US 4,046,191 AExxon Production Research Company · 1977
- Choke for controlling the flow of drilling mud105US 4,257,442 A1981
- Subsea choke and riser pressure equalization system92US 4,210,208 ASedco, Inc. · 1980
- Pressure balanced gate valve having selective actuator systems84US 4,230,299 APetroleum Designers, Inc. · 1980
- Apparatus and method for controlling the flow of fluids from a well bore79US 4,044,834 A1977