E21B 21/02
Swivel joints in hose-lines
E21B21/02 (Swivel joints in hose-lines) appears on 182 US grants and 141 published applications in this corpus.
Search patents in E21B- Granted patents
- 182
- Published applications
- 141
- Assignees
- 85
- Inventors
- 290
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 4 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 0 |
| 2003 | 2 | 4 |
| 2004 | 1 | 3 |
| 2005 | 0 | 3 |
| 2006 | 3 | 7 |
| 2007 | 6 | 6 |
| 2008 | 4 | 9 |
| 2009 | 5 | 3 |
| 2010 | 10 | 7 |
| 2011 | 5 | 6 |
| 2012 | 5 | 8 |
| 2013 | 8 | 7 |
| 2014 | 9 | 9 |
| 2015 | 2 | 11 |
| 2016 | 4 | 7 |
| 2017 | 12 | 12 |
| 2018 | 15 | 8 |
| 2019 | 10 | 9 |
| 2020 | 11 | 2 |
| 2021 | 3 | 5 |
| 2022 | 2 | 2 |
| 2023 | 3 | 6 |
| 2024 | 7 | 4 |
| 2025 | 3 | 1 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Swivel seal assembly and alignment method5 May 2026US 12,618,474 B2Deublin Company
- Underground drill rig and systems and methods of using same7 Apr 2026US 12,595,706 B2Boart Longyear Manufacturing And Distribution Inc.
- Sealing ring and joint for oil drilling plant24 Mar 2026US 12,584,365 B2Meccanotecnica Umbra S.p.A.
- Lift-ready flowhead assembly16 Dec 2025US 12,497,863 B2M & M Oil Tools, LLC
- Washpipe assembly25 Nov 2025US 12,480,376 B2Forum US, Inc.
- Swivel seal assembly and alignment method12 Mar 2026US 2026/0071682 A1Deublin Company
- Sealing ring and joint for oil drilling plant9 Jan 2025US 2025/0012162 A1Meccanotecnica Umbra S.p.A.
- Washpipe assembly12 Sep 2024US 2024/0301761 A1Forum US, Inc.
- Bi-directional spring filter11 Jul 2024US 2024/0226778 A9
- Underground Drill Rig And Systems And Methods Of Using Same16 May 2024US 2024/0159107 A1Longyear TM, Inc.
Most cited
By later US patents
- Top drive casing system213US 6,536,520 B1Weatherford/Lamb, Inc. · 2003
- Well drilling assembly146US 4,593,773 AMaritime Hydraulics AS · 1986
- Drilling a well gas supply in the drilling liquid124US 5,411,105 AKidco Resources Ltd. · 1995
- Continuous circulation apparatus for air drilling well bore operations118US 4,315,553 A1982
- Methods and apparatus for handling and drilling with tubulars or casing105US 7,325,610 B2Weatherford/Lamb, Inc. · 2008