E21B 33/1294
Characterised by a valve
Official title: {characterised by a valve, e.g. a by-pass valve}
E21B33/1294 (Characterised by a valve) appears on 301 US grants and 144 published applications in this corpus.
Search patents in E21B- Granted patents
- 301
- Published applications
- 144
- Assignees
- 109
- Inventors
- 421
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 7 | 0 |
| 1979 | 8 | 0 |
| 1980 | 7 | 0 |
| 1981 | 8 | 0 |
| 1982 | 7 | 0 |
| 1983 | 11 | 0 |
| 1984 | 20 | 0 |
| 1985 | 9 | 0 |
| 1986 | 9 | 0 |
| 1987 | 14 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 9 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 7 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 5 | 5 |
| 2003 | 1 | 4 |
| 2004 | 2 | 6 |
| 2005 | 2 | 3 |
| 2006 | 6 | 4 |
| 2007 | 1 | 2 |
| 2008 | 5 | 3 |
| 2009 | 2 | 8 |
| 2010 | 7 | 4 |
| 2011 | 4 | 9 |
| 2012 | 7 | 7 |
| 2013 | 6 | 6 |
| 2014 | 4 | 0 |
| 2015 | 8 | 9 |
| 2016 | 7 | 8 |
| 2017 | 4 | 3 |
| 2018 | 5 | 9 |
| 2019 | 12 | 8 |
| 2020 | 7 | 6 |
| 2021 | 8 | 15 |
| 2022 | 11 | 10 |
| 2023 | 11 | 8 |
| 2024 | 8 | 4 |
| 2025 | 3 | 2 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods and systems for fracing7 Jul 2026US 12,674,379 B2Hangzhou Guangli Technology Co., Ltd.
- Selective well barrier bottom, system, and method28 Apr 2026US 12,612,838 B2
- Retrievable packer apparatus21 Apr 2026US 12,607,093 B2Metrol Technology Limited
- Plug with shuttle valve20 May 2025US 12,305,470 B2Tally USA, LLC
- Wireless casing packer20 May 2025US 12,305,474 B2Metrol Technology Limited
- Seal-bore arrangement for a wellbore tubing disconnection tool5 Mar 2026US 2026/0063015 A1Halliburton Energy Services.Inc.
- Selective well barrier bottom, system, and method23 Oct 2025US 2025/0327369 A1Baker Hughes Oilfield Operations LLC
- Wireless casing packer7 Aug 2025US 2025/0250877 A1Metrol Technology Limited
- Casing packer13 Jun 2024US 2024/0191592 A1Metrol Technology Limited
- Retrievable packer apparatus13 Jun 2024US 2024/0191597 A1Metrol Technology Limited
Most cited
By later US patents
- Wellbore tool with disintegratable components and method of controlling flow249US 7,350,582 B2Weatherford/Lamb, Inc. · 2008
- Downhole tool apparatus with non-metallic components and methods of drilling thereof241US 5,224,540 AHalliburton Company · 1993
- Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters221US 6,958,704 B2Shell Oil Company · 2005
- Downhole tool apparatus with non-metallic components and methods of drilling thereof218US 5,271,468 AHalliburton Company · 1993
- Drillable bridge plug210US 4,784,226 AArrow Oil Tools, Inc. · 1988