E21B 17/1021
With articulated arms or arcuate springs
Official title: {with articulated arms or arcuate springs}
E21B17/1021 (With articulated arms or arcuate springs) appears on 462 US grants and 363 published applications in this corpus.
Search patents in E21B- Granted patents
- 462
- Published applications
- 363
- Assignees
- 169
- Inventors
- 718
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 10 | 0 |
| 1986 | 6 | 0 |
| 1987 | 5 | 0 |
| 1988 | 8 | 0 |
| 1989 | 10 | 0 |
| 1990 | 8 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 6 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 1 |
| 2002 | 8 | 7 |
| 2003 | 6 | 8 |
| 2004 | 4 | 8 |
| 2005 | 5 | 3 |
| 2006 | 7 | 6 |
| 2007 | 10 | 7 |
| 2008 | 2 | 11 |
| 2009 | 4 | 13 |
| 2010 | 10 | 9 |
| 2011 | 12 | 16 |
| 2012 | 9 | 13 |
| 2013 | 9 | 12 |
| 2014 | 17 | 17 |
| 2015 | 14 | 35 |
| 2016 | 12 | 25 |
| 2017 | 21 | 24 |
| 2018 | 32 | 24 |
| 2019 | 18 | 21 |
| 2020 | 29 | 21 |
| 2021 | 21 | 27 |
| 2022 | 25 | 17 |
| 2023 | 19 | 15 |
| 2024 | 21 | 12 |
| 2025 | 11 | 5 |
| 2026 | 12 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Modular anti-rotation drilling systems and methods actuated by fluid pressure29 Sep 2026US 12,747,654 B1National Technology & Engineering Solutions of Sandia, LLC
- Locator for survey apparatus2 Jun 2026US 12,644,345 B2Imdex Technologies Pty Ltd
- Well tool with an angle orienting feature12 May 2026US 12,624,605 B2Well Conveyor AS
- Expanding metal for plug and abandonment12 May 2026US 12,624,611 B2Halliburton Energy Services.Inc.
- Decentralizer tool for use with wireline logging operations28 Apr 2026US 12,612,829 B1King Fahd University of Petroleum and Minerals
- Centralizer with integral stop collar1 Oct 2026US 2026/0298035 A1Centergenics, LLC
- Expanding metal for plug and abandonment20 Aug 2026US 2026/0243144 A1Halliburton Energy Services.Inc.
- High expansion centralizer16 Jul 2026US 2026/0201756 A1Schlumberger Technology Corporation
- Centralizer for A Tool in A Drill Collar25 Jun 2026US 2026/0176926 A1Nabors Drilling Technologies USA, Inc.
- Through-rotary centralizer19 Mar 2026US 2026/0078641 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Downhole tools using artificial intelligence based control225US 5,947,213 AIntelligent Inspection Corporation · 1999
- Downhole apparatus and method for expanding a tubing203US 6,012,523 APetroline Wellsystems Limited · 2000
- Autonomous downhole oilfield tool191US 6,378,627 B1Intelligent Inspection Corporation · 2002
- Anti-whirl underreamer185US 5,402,856 AAmoco Corporation · 1995
- Downhole tools using artificial intelligence based control170US 6,026,911 AIntelligent Inspection Corporation · 2000