E21B 21/103
Down-hole by-pass valve arrangements, i.e. between the inside of the drill string
Official title: {Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus (valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints E21B21/019)}
E21B21/103 (Down-hole by-pass valve arrangements, i.e. between the inside of the drill string) appears on 631 US grants and 607 published applications in this corpus.
Search patents in E21B- Granted patents
- 631
- Published applications
- 607
- Assignees
- 254
- Inventors
- 1,078
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 9 | 0 |
| 2000 | 8 | 0 |
| 2001 | 13 | 2 |
| 2002 | 11 | 8 |
| 2003 | 12 | 11 |
| 2004 | 13 | 24 |
| 2005 | 7 | 13 |
| 2006 | 16 | 19 |
| 2007 | 12 | 17 |
| 2008 | 19 | 19 |
| 2009 | 9 | 23 |
| 2010 | 15 | 25 |
| 2011 | 18 | 25 |
| 2012 | 20 | 29 |
| 2013 | 19 | 47 |
| 2014 | 33 | 37 |
| 2015 | 31 | 36 |
| 2016 | 41 | 32 |
| 2017 | 25 | 25 |
| 2018 | 29 | 44 |
| 2019 | 34 | 30 |
| 2020 | 38 | 34 |
| 2021 | 32 | 24 |
| 2022 | 29 | 27 |
| 2023 | 26 | 18 |
| 2024 | 24 | 16 |
| 2025 | 14 | 7 |
| 2026 | 13 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Desander assembly for plunger lift system25 Aug 2026US 12,716,343 B2
- Stall detection and recovery for mud motors25 Aug 2026US 12,716,348 B2Helmerich & Payne, Inc.
- Fasteners for an underwater drilling assembly18 Aug 2026US 12,709,366 B2Resolve Marine Group, Inc.
- Cleaning tool and method18 Aug 2026US 12,709,963 B2Cortrax Global Limited
- Clutch assembly for a drill string and related methods11 Aug 2026US 12,704,033 B2NTS Amega West USA, Inc.
- On demand flow pulsing system20 Aug 2026US 2026/0243134 A1National Oilwell Varco, L. P.
- Convertible Autofill Float Equipment Having Poppet Valve and Sliding Sleeve20 Aug 2026US 2026/0243146 A1Weatherford Technology Holdings, LLC
- Field injection port13 Aug 2026US 2026/0235004 A1Velan Inc.
- Radio frequency identifier based telemetry for surface and downhole communication13 Aug 2026US 2026/0235026 A1Schlumberger Technology Corporation
- Air-bleed assembly for an underwater drilling assembly25 Jun 2026US 2026/0176927 A1Resolve Marine Group, Inc.
Most cited
By later US patents
- Downhole surge pressure reduction system and method of use340US 5,960,881 AJerry P. Allamon · 1999
- Circulation tool193US 6,253,861 B1Specialised Petroleum Services Limited · 2001
- Downhole valve for oil/gas well187US 5,499,687 A1996
- Apparatus and method for orienting and setting a hydraulically-actuatable tool in a borehole180US 5,443,129 ASmith International, Inc. · 1995
- Formation isolation and testing apparatus and method172US 5,803,186 ABaker Hughes Incorporated · 1998