E21B 33/06
Blow-out preventers , i.e. apparatus closing around a drill pipe
Official title: Blow-out preventers {, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers (rotating blow-out preventers E21B33/085)}
E21B33/06 (Blow-out preventers , i.e. apparatus closing around a drill pipe) appears on 1,656 US grants and 1,561 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,656
- Published applications
- 1,561
- Assignees
- 437
- Inventors
- 2,113
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 13 | 0 |
| 1978 | 14 | 0 |
| 1979 | 6 | 0 |
| 1980 | 12 | 0 |
| 1981 | 10 | 0 |
| 1982 | 18 | 0 |
| 1983 | 7 | 0 |
| 1984 | 23 | 0 |
| 1985 | 27 | 0 |
| 1986 | 15 | 0 |
| 1987 | 14 | 0 |
| 1988 | 2 | 0 |
| 1989 | 12 | 0 |
| 1990 | 14 | 0 |
| 1991 | 17 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 8 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 11 | 0 |
| 1998 | 11 | 0 |
| 1999 | 16 | 0 |
| 2000 | 12 | 0 |
| 2001 | 11 | 6 |
| 2002 | 18 | 13 |
| 2003 | 13 | 18 |
| 2004 | 11 | 22 |
| 2005 | 16 | 17 |
| 2006 | 20 | 27 |
| 2007 | 17 | 19 |
| 2008 | 20 | 38 |
| 2009 | 14 | 16 |
| 2010 | 22 | 24 |
| 2011 | 14 | 51 |
| 2012 | 27 | 68 |
| 2013 | 47 | 87 |
| 2014 | 69 | 88 |
| 2015 | 97 | 108 |
| 2016 | 92 | 140 |
| 2017 | 93 | 147 |
| 2018 | 122 | 130 |
| 2019 | 130 | 119 |
| 2020 | 110 | 88 |
| 2021 | 102 | 84 |
| 2022 | 70 | 67 |
| 2023 | 74 | 67 |
| 2024 | 65 | 52 |
| 2025 | 56 | 43 |
| 2026 | 35 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Automatic thrust activated multi-speed reduction gear and clutch system and method22 Sep 2026US 12,742,362 B2Schlumberger Technology Corporation
- Well equipment system configuration framework15 Sep 2026US 12,737,105 B2Schlumberger Technology Corporation
- Closing unit system for a blowout preventer8 Sep 2026US 12,729,597 B2Schlumberger Technology Corporation
- High torque actuated tubing hanger orientation11 Aug 2026US 12,704,037 B2FMC Kongsberg Subsea AS
- Apparatus for thermal activation of blow-out preventers of oil and gas wells11 Aug 2026US 12,704,038 B1Saudi Arabian Oil Company
- Electric annular with internal motor8 Oct 2026US 2026/0308997 A1Schlumberger Technology Corporation
- Systems and methods for cutting coiled tubing strings at a wellsite24 Sep 2026US 2026/0286803 A1Grant Prideco, L.P.
- Blowout preventer quick connect bonnet system27 Aug 2026US 2026/0251031 A1Schlumberger Technology Corporation
- Intensifier ram blowout preventer20 Aug 2026US 2026/0243140 A1BOP Technologies, INC
- Annular Blow Out Preventer20 Aug 2026US 2026/0243141 A1SRI Energy, Inc.
Most cited
By later US patents
- Subsea hydraulic choke193US 4,046,191 AExxon Production Research Company · 1977
- Marine riser well control method and apparatus160US 4,626,135 AHydril Company · 1986
- Flow diverter155US 4,444,250 AHydril Company · 1984
- Blowout preventer protector and method of using same135US 6,364,024 B12002
- Method and apparatus for replacing BOP with gate valve121US 6,601,650 B2Worldwide Oilfield Machine, Inc. · 2003