E21B 17/16
Drill collars
E21B17/16 (Drill collars) 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
- 316
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 6 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 2 |
| 2004 | 1 | 4 |
| 2005 | 2 | 3 |
| 2006 | 3 | 1 |
| 2007 | 1 | 4 |
| 2008 | 2 | 2 |
| 2009 | 1 | 5 |
| 2010 | 5 | 7 |
| 2011 | 5 | 5 |
| 2012 | 2 | 3 |
| 2013 | 3 | 5 |
| 2014 | 4 | 6 |
| 2015 | 6 | 14 |
| 2016 | 5 | 11 |
| 2017 | 9 | 10 |
| 2018 | 9 | 15 |
| 2019 | 15 | 7 |
| 2020 | 14 | 10 |
| 2021 | 9 | 9 |
| 2022 | 16 | 8 |
| 2023 | 7 | 3 |
| 2024 | 1 | 4 |
| 2025 | 4 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Spring collar shoulder28 Jul 2026US 12,692,962 B1Schlumberger Technology Corporation
- Systems and apparatus for orienting one or more tools in a tool string and methods of manufacture, assembly and use thereof3 Jun 2025US 12,320,211 B1SWM International, LLC
- Centralizer for downhole probes13 May 2025US 12,297,735 B2Baker Hughes Canada Company
- Float equipment for use with composite casing or liner string8 Apr 2025US 12,270,262 B2Downhole Products Limited
- Dual rod assembly and collar installation method8 Apr 2025US 12,270,263 B2The Charles Machine Works, Inc.
- Internally-Wound Stop Ring30 Apr 2026US 2026/0117603 A1Shaanxi Newland Industrial Co., Limited
- End piece of drill pipe, drill pipe assembly and method5 Mar 2026US 2026/0063006 A1Sandvik Mining and Construction Tools AB
- Conveyance protection device, method, and system4 Dec 2025US 2025/0369293 A1Baker Hughes Oilfield Operations LLC
- Center tube retention19 Dec 2024US 2024/0418046 A1Terelion, LLC
- Centralizer for downhole probes11 Jul 2024US 2024/0229573 A9Baker Hughes Canada Company
Most cited
By later US patents
- Insulated drill collar gap sub assembly for a toroidal coupled telemetry system103US 4,348,672 ATele-Drill, Inc. · 1982
- Insulated drill collar gap sub assembly for a toroidal coupled telemetry system91US 4,496,174 ATele-Drill, Inc. · 1985
- Device for transmitting to the surface the signal from a transmitter located at a great depth79US 4,684,946 AGeoservices · 1987
- Downhole tool sensor system and method67US 7,775,099 B2Schlumberger Technology Corporation · 2010
- Method for stabilizing a rotary drill string and drill bit63US 4,982,802 AAmoco Corporation · 1991