E21B 19/008
Winding units, specially adapted for drilling operations
Official title: {Winding units, specially adapted for drilling operations}
E21B19/008 (Winding units, specially adapted for drilling operations) appears on 284 US grants and 303 published applications in this corpus.
Search patents in E21B- Granted patents
- 284
- Published applications
- 303
- Assignees
- 145
- Inventors
- 600
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 3 |
| 2005 | 5 | 3 |
| 2006 | 2 | 3 |
| 2007 | 5 | 2 |
| 2008 | 0 | 5 |
| 2009 | 5 | 3 |
| 2010 | 2 | 4 |
| 2011 | 2 | 6 |
| 2012 | 1 | 5 |
| 2013 | 0 | 4 |
| 2014 | 6 | 6 |
| 2015 | 4 | 6 |
| 2016 | 5 | 14 |
| 2017 | 7 | 33 |
| 2018 | 17 | 43 |
| 2019 | 36 | 46 |
| 2020 | 43 | 31 |
| 2021 | 25 | 21 |
| 2022 | 21 | 16 |
| 2023 | 21 | 16 |
| 2024 | 21 | 10 |
| 2025 | 9 | 10 |
| 2026 | 9 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Single-lift wireline intervention unit for offshore wells29 Sep 2026US 12,747,643 B1Expro North Sea Limited
- Method and system for controlling a multi-stage wireline operation in a well15 Sep 2026US 12,735,948 B2
- Composite umbilical for pulse power boring system25 Aug 2026US 12,716,297 B2Halliburton Energy Services.Inc.
- Wireline derrick, system, and process4 Aug 2026US 12,698,691 B2
- Dual line drawworks2 Jun 2026US 12,644,341 B2Helmerich & Payne, Inc.
- Pump installation apparatus, pump installation method, and pump removing method24 Sep 2026US 2026/0286799 A1
- Composite umbilical for pulse power boring system16 Jul 2026US 2026/0201753 A1Halliburton Energy Services.Inc.
- Earth drilling device for cable-guided drilling and method for inserting a drill string into the ground using an earth drilling device for cable-guided drilling9 Jul 2026US 2026/0193944 A1TRACTO-TECHNIK GmbH & Co. KG
- Earth-working machine and method for operating an earth-working machine14 May 2026US 2026/0132689 A1BAUER Maschinen GmbH
- Drawworks Hydraulic Brake Performance Assessment System30 Apr 2026US 2026/0116713 A1
Most cited
By later US patents
- AC powered service rig160US 7,717,193 B2Nabors Canada · 2010
- Draw-works and method for operating the same154US 10,138,098 B2National Oilwell Varco Norway AS · 2018
- Control system for drawworks operations74US 6,029,951 AVarco International, Inc. · 2000
- Hoisting gear49US 6,793,203 B2Wirth Maschinen-und Bohrgeratefabrik GmbH · 2004
- Arrangement in connection with drilling of oil wells especially with coil tubing35US 6,000,480 AMercur Slimhole Drilling Intervention AS · 1999