E21B 33/08
Wipers
Official title: Wipers; Oil savers
E21B33/08 (Wipers) appears on 811 US grants and 614 published applications in this corpus.
Search patents in E21B- Granted patents
- 811
- Published applications
- 614
- Assignees
- 257
- Inventors
- 1,040
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 9 | 0 |
| 1983 | 10 | 0 |
| 1984 | 11 | 0 |
| 1985 | 13 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 13 | 0 |
| 1991 | 12 | 0 |
| 1992 | 14 | 0 |
| 1993 | 12 | 0 |
| 1994 | 13 | 0 |
| 1995 | 11 | 0 |
| 1996 | 8 | 0 |
| 1997 | 8 | 0 |
| 1998 | 6 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 8 | 4 |
| 2002 | 13 | 8 |
| 2003 | 5 | 10 |
| 2004 | 8 | 10 |
| 2005 | 9 | 15 |
| 2006 | 10 | 13 |
| 2007 | 13 | 13 |
| 2008 | 11 | 8 |
| 2009 | 6 | 26 |
| 2010 | 22 | 23 |
| 2011 | 19 | 25 |
| 2012 | 14 | 27 |
| 2013 | 19 | 37 |
| 2014 | 20 | 29 |
| 2015 | 36 | 37 |
| 2016 | 36 | 39 |
| 2017 | 29 | 42 |
| 2018 | 43 | 43 |
| 2019 | 53 | 31 |
| 2020 | 45 | 27 |
| 2021 | 38 | 38 |
| 2022 | 36 | 31 |
| 2023 | 22 | 18 |
| 2024 | 32 | 20 |
| 2025 | 34 | 22 |
| 2026 | 22 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fluid containment system and method22 Sep 2026US 12,742,363 B1Pruitt Tool & Supply Co.
- 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
- Wellhead attachment device28 Jul 2026US 12,692,761 B2
- High pressure stripping elements24 Sep 2026US 2026/0286804 A1
- 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
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