E21B 33/085
Rotatable packing means
Official title: {Rotatable packing means, e.g. rotating blow-out preventers}
E21B33/085 (Rotatable packing means) appears on 516 US grants and 452 published applications in this corpus.
Search patents in E21B- Granted patents
- 516
- Published applications
- 452
- Assignees
- 136
- Inventors
- 608
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 6 | 0 |
| 1983 | 6 | 0 |
| 1984 | 6 | 0 |
| 1985 | 7 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 4 |
| 2002 | 4 | 2 |
| 2003 | 4 | 7 |
| 2004 | 5 | 7 |
| 2005 | 6 | 11 |
| 2006 | 6 | 10 |
| 2007 | 11 | 9 |
| 2008 | 9 | 5 |
| 2009 | 3 | 20 |
| 2010 | 17 | 17 |
| 2011 | 15 | 17 |
| 2012 | 11 | 20 |
| 2013 | 14 | 23 |
| 2014 | 16 | 23 |
| 2015 | 24 | 31 |
| 2016 | 25 | 32 |
| 2017 | 20 | 31 |
| 2018 | 33 | 33 |
| 2019 | 38 | 24 |
| 2020 | 37 | 21 |
| 2021 | 28 | 32 |
| 2022 | 30 | 19 |
| 2023 | 19 | 11 |
| 2024 | 21 | 13 |
| 2025 | 23 | 14 |
| 2026 | 18 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Well control system and method of use8 Sep 2026US 12,729,592 B2Deep Blue Oil & Gas Limited
- Rotating control device clamping mechanism25 Aug 2026US 12,716,313 B2Beyond Energy Services & Technology Corp.
- Measuring drill pipe alignment in rotating control device system11 Aug 2026US 12,704,039 B2Schlumberger Technology Corporation
- Rotating control device with variable pressure compensation23 Jun 2026US 12,662,890 B1Schlumberger Technology Corporation
- Top pot assembly16 Jun 2026US 12,655,707 B1Pruitt Tool & Supply Co.
- Rotating control device assembly for use with a subterranean well20 Aug 2026US 2026/0243142 A1
- Wellbore balanced pressure compensation for rotating control device (rcd) rotary seals13 Aug 2026US 2026/0235010 A1Schlumberger Technology Corporation
- Rotating control device with damper assembly23 Jul 2026US 2026/0210202 A1Schlumberger Technology Corporation
- Integrated riser joint, component orientation and application within the riser string, including seabed16 Jul 2026US 2026/0201769 A1Schlumberger Technology Corporation
- Rotating control device16 Jul 2026US 2026/0201770 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Method and apparatus for deepwater drilling283US 4,813,495 AConoco Inc. · 1989
- Rotating blowout preventor193US 5,647,444 A1997
- Hydraulic clamp for rotary drilling head173US 5,022,472 AMASX Energy Services Group, Inc. · 1991
- Rotating subsea diverter162US 6,230,824 B1Hydril Company · 2001
- Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment154US 6,138,774 AWeatherford Holding U.S., Inc. · 2000