E21B 25/10
Formed core retaining or severing means
Official title: Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence)
E21B25/10 (Formed core retaining or severing means) appears on 122 US grants and 101 published applications in this corpus.
Search patents in E21B- Granted patents
- 122
- Published applications
- 101
- Assignees
- 78
- Inventors
- 306
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 2 |
| 2003 | 1 | 1 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 4 |
| 2010 | 0 | 3 |
| 2011 | 2 | 3 |
| 2012 | 2 | 0 |
| 2013 | 1 | 2 |
| 2014 | 2 | 3 |
| 2015 | 2 | 10 |
| 2016 | 1 | 6 |
| 2017 | 8 | 6 |
| 2018 | 9 | 9 |
| 2019 | 4 | 10 |
| 2020 | 15 | 6 |
| 2021 | 6 | 5 |
| 2022 | 5 | 16 |
| 2023 | 10 | 1 |
| 2024 | 6 | 5 |
| 2025 | 4 | 6 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sidewall coring tools having active circulation features28 Jul 2026US 12,692,787 B2Schlumberger Technology Corporation
- Core sample handling device24 Feb 2026US 12,560,038 B2Coremax Limited
- Device and system for orienting core samples10 Feb 2026US 12,546,210 B2Stockholm Precision Tools, S.L.
- Coring tool, coring method, and application thereof6 Jan 2026US 12,516,581 B2China Petroleum & Chemical Corporation
- Rapid assembly and automatic sampling drilling tool for frozen soil layer exploration7 Oct 2025US 12,435,588 B2Powerchina Huadong Engineering Corporation Limited
- Pressure-preserved coring tool, use method, and reservoir analysis method19 Mar 2026US 2026/0078647 A1China National Petroleum Corporation
- Core sample handling device12 Mar 2026US 2026/0071509 A1Coremax Limited
- Sidewall coring tools having active circulation features16 Oct 2025US 2025/0320816 A1Schlumberger Technology Corporation
- Rapid assembly and automatic sampling drilling tool for frozen soil layer exploration14 Aug 2025US 2025/0257624 A1Powerchina Huadong Engineering Corporation Limited
- Coring tool, coring method, and application thereof20 Feb 2025US 2025/0059841 A1China Petroleum & Chemical Corporation
Most cited
By later US patents
- Coring device with an improved core sleeve and anti-gripping collar with a collective core catcher107US 4,566,545 ANorton Christensen, Inc. · 1986
- Junk basket and method of removing foreign material from a well73US 4,059,155 AInternational Enterprises, Inc. · 1977
- Rock melting excavation process63US 5,107,936 ATechnologies Transfer Est. · 1992
- Profile melting-drill process and device45US 5,168,940 ATechnologie Transfer Est. · 1992
- Coring tool43US 4,930,587 ADiamant Boart-Stratabit (USA) Inc. · 1990