E21B 34/02
In well heads
Official title: in well heads
E21B34/02 (In well heads) appears on 1,324 US grants and 1,219 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,324
- Published applications
- 1,219
- Assignees
- 390
- Inventors
- 1,903
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 9 | 0 |
| 1981 | 11 | 0 |
| 1982 | 10 | 0 |
| 1983 | 6 | 0 |
| 1984 | 12 | 0 |
| 1985 | 13 | 0 |
| 1986 | 12 | 0 |
| 1987 | 16 | 0 |
| 1988 | 7 | 0 |
| 1989 | 17 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 9 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 16 | 0 |
| 2000 | 14 | 0 |
| 2001 | 19 | 11 |
| 2002 | 17 | 17 |
| 2003 | 18 | 20 |
| 2004 | 17 | 24 |
| 2005 | 13 | 16 |
| 2006 | 21 | 15 |
| 2007 | 13 | 12 |
| 2008 | 8 | 9 |
| 2009 | 7 | 17 |
| 2010 | 5 | 14 |
| 2011 | 9 | 31 |
| 2012 | 17 | 36 |
| 2013 | 31 | 38 |
| 2014 | 38 | 56 |
| 2015 | 35 | 72 |
| 2016 | 50 | 63 |
| 2017 | 58 | 67 |
| 2018 | 64 | 73 |
| 2019 | 76 | 68 |
| 2020 | 65 | 89 |
| 2021 | 73 | 85 |
| 2022 | 103 | 92 |
| 2023 | 99 | 106 |
| 2024 | 111 | 80 |
| 2025 | 83 | 66 |
| 2026 | 45 | 42 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Inline fracturing valve systems and methods6 Oct 2026US 12,753,683 B2Cameron International Corporation
- Back pressure valve with contingency release15 Sep 2026US 12,735,955 B2Saudi Arabian Oil Company
- Hydraulic fracturing plan and execution of same8 Sep 2026US 12,729,600 B2Downing Wellhead Equipment, LLC
- Method and apparatus for moving tubular rotary slips25 Aug 2026US 12,716,301 B2Helmerich & Payne, Inc.
- Conditioning a tubing head back pressure valve receptacle25 Aug 2026US 12,716,312 B2Saudi Arabian Oil Company
- Advancing a tubular string in a wellbore24 Sep 2026US 2026/0286800 A1
- A piping system to recover fluid from a well or to inject fluid in a well and related method24 Sep 2026US 2026/0286808 A1Totalenergies Onetech
- System and method for barrier testing injection xmas tree24 Sep 2026US 2026/0286840 A1
- Pressure response test to detect leakage of rotating control device24 Sep 2026US 2026/0286841 A1Schlumberger Technology Corporation
- Full Drift Through a Gas Lift Injection Packer Assembly3 Sep 2026US 2026/0258718 A1ChampionX LLC
Most cited
By later US patents
- Subsea hydraulic choke193US 4,046,191 AExxon Production Research Company · 1977
- Wellhead138US 5,544,707 ACooper Cameron Corporation · 1996
- 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
- Subsea wellhead apparatus87US 5,143,158 ADril-Quip, Inc. · 1992