E21B 21/106
Valve arrangements outside the borehole
Official title: {Valve arrangements outside the borehole, e.g. kelly valves (valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints E21B21/019)}
E21B21/106 (Valve arrangements outside the borehole) appears on 499 US grants and 420 published applications in this corpus.
Search patents in E21B- Granted patents
- 499
- Published applications
- 420
- Assignees
- 177
- Inventors
- 738
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 7 | 0 |
| 1982 | 6 | 0 |
| 1983 | 3 | 0 |
| 1984 | 12 | 0 |
| 1985 | 7 | 0 |
| 1986 | 10 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 8 | 0 |
| 1997 | 1 | 0 |
| 1998 | 6 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 9 | 5 |
| 2002 | 6 | 11 |
| 2003 | 10 | 6 |
| 2004 | 9 | 7 |
| 2005 | 4 | 8 |
| 2006 | 12 | 13 |
| 2007 | 6 | 13 |
| 2008 | 8 | 10 |
| 2009 | 5 | 14 |
| 2010 | 8 | 16 |
| 2011 | 11 | 19 |
| 2012 | 9 | 22 |
| 2013 | 12 | 19 |
| 2014 | 23 | 17 |
| 2015 | 15 | 27 |
| 2016 | 18 | 27 |
| 2017 | 20 | 29 |
| 2018 | 24 | 27 |
| 2019 | 27 | 17 |
| 2020 | 26 | 34 |
| 2021 | 29 | 25 |
| 2022 | 31 | 12 |
| 2023 | 28 | 14 |
| 2024 | 17 | 9 |
| 2025 | 16 | 11 |
| 2026 | 12 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and apparatus for automatic drill out8 Sep 2026US 12,729,591 B2Tetra Technologies, Inc.
- Valve cartridge8 Sep 2026US 12,729,593 B2SPM Oil & Gas Inc.
- Fasteners for an underwater drilling assembly18 Aug 2026US 12,709,366 B2Resolve Marine Group, Inc.
- Debris catch for managed pressure drilling23 Jun 2026US 12,662,888 B1Pruitt Tool & Supply Co.
- Electromagnetically actuated pressure relief valve for fracturing systems9 Jun 2026US 12,650,179 B2
- Flow diversion in managed pressure drilling operations9 Jul 2026US 2026/0193948 A1
- Air-bleed assembly for an underwater drilling assembly25 Jun 2026US 2026/0176927 A1Resolve Marine Group, Inc.
- Choke system to control fluid pressure18 Jun 2026US 2026/0168350 A1Schlumberger Technology Corporation
- Drill stem safety valve actuator14 May 2026US 2026/0132864 A1Hi-Kalibre Equipment Ltd.
- Frame for an underwater drilling assembly8 Jan 2026US 2026/0008527 A1Resolve Marine Group, Inc.
Most cited
By later US patents
- Hydraulic top drive for wells174US 4,813,493 ATriten Corporation · 1989
- Marine riser well control method and apparatus160US 4,626,135 AHydril Company · 1986
- Casing circulator and method160US 5,191,939 ATam International, Inc. · 1993
- Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing160US 5,735,348 AFrank's International, LLC · 1998
- Casing circulator and method158US 4,997,042 A1991