E21B 17/1028
With arcuate springs only
Official title: {with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations}
E21B17/1028 (With arcuate springs only) appears on 198 US grants and 175 published applications in this corpus.
Search patents in E21B- Granted patents
- 198
- Published applications
- 175
- Assignees
- 81
- Inventors
- 250
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 5 | 3 |
| 2003 | 2 | 4 |
| 2004 | 1 | 3 |
| 2005 | 2 | 1 |
| 2006 | 2 | 1 |
| 2007 | 4 | 3 |
| 2008 | 0 | 6 |
| 2009 | 1 | 10 |
| 2010 | 6 | 5 |
| 2011 | 6 | 7 |
| 2012 | 6 | 5 |
| 2013 | 4 | 10 |
| 2014 | 11 | 11 |
| 2015 | 9 | 20 |
| 2016 | 6 | 15 |
| 2017 | 13 | 15 |
| 2018 | 19 | 8 |
| 2019 | 13 | 8 |
| 2020 | 8 | 5 |
| 2021 | 6 | 7 |
| 2022 | 7 | 8 |
| 2023 | 5 | 9 |
| 2024 | 11 | 5 |
| 2025 | 5 | 2 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Locator for survey apparatus2 Jun 2026US 12,644,345 B2Imdex Technologies Pty Ltd
- Decentralizer tool for use with wireline logging operations28 Apr 2026US 12,612,829 B1King Fahd University of Petroleum and Minerals
- Device for centering a sensor assembly in a bore21 Apr 2026US 12,607,075 B1Petromac IP Limited
- Centralizer for a tool in a drill collar7 Apr 2026US 12,595,708 B2Nabors Drilling Technologies USA, Inc.
- Controlling logging tool orientation in a wellbore3 Feb 2026US 12,540,542 B2Saudi Arabian Oil Company
- Centralizer with integral stop collar1 Oct 2026US 2026/0298035 A1Centergenics, LLC
- Centralizer for A Tool in A Drill Collar25 Jun 2026US 2026/0176926 A1Nabors Drilling Technologies USA, Inc.
- Controlling logging tool orientation in a wellbore15 Jan 2026US 2026/0015936 A1Saudi Arabian Oil Company
- Locator for survey apparatus3 Jul 2025US 2025/0215754 A1Imdex Technologies Pty Ltd
- Centralizer having internal stop collar3 Apr 2025US 2025/0109640 A1Downhole Products Limited
Most cited
By later US patents
- Methods and apparatus for actuating a downhole tool167US 7,252,152 B2Weatherford/Lamb, Inc. · 2007
- Methods and apparatus for actuating a downhole tool79US 7,503,398 B2Weatherford/Lamb, Inc. · 2009
- Centralizer76US 5,575,333 AWeatherford U. S., Inc. · 1996
- Centralizers for oil well casings74US 5,261,488 AWeatherford U.K. Limited · 1993
- Method for permanent emplacement of sensors inside casing68US 6,131,658 AHalliburton Energy Services.Inc. · 2000