E21B 25/04
The core receiver having a core forming cutting edge or element
Official title: the core receiver having a core forming cutting edge or element, e.g. punch type core barrels
E21B25/04 (The core receiver having a core forming cutting edge or element) appears on 39 US grants and 12 published applications in this corpus.
Search patents in E21B- Granted patents
- 39
- Published applications
- 12
- Assignees
- 25
- Inventors
- 65
- Latest grant
- 10 May 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 1 |
| 2020 | 2 | 2 |
| 2021 | 1 | 3 |
| 2022 | 2 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Portable seafloor drill rig for submersible for multi-point core drilling10 May 2022US 11,326,398 B2Hunan University of Science and Technology
- Weed remover22 Mar 2022US 11,277,952 B2Andre Lafleur RD & D Inc.
- Pressure-retaining cap screwing and unscrewing device for marine natural gas hydrate pressure-retaining rock-core barrel16 Mar 2021US 10,947,800 B2Hunan University of Science and Technology
- Inner barrel crimping connection for a coring tool8 Sep 2020US 10,767,431 B2Halliburton Energy Services.Inc.
- Deep rock in-situ active thermal-insulation coring device and thermal-insulation coring method thereof18 Aug 2020US 10,745,989 B2Shenzhen University
- Greaseless core barrel head assembly6 Mar 2025US 2025/0075576 A1Longyear TM, Inc.
- Drilling arrangements4 Aug 2022US 2022/0243536 A1REED, Paul
- Method and apparatus for concentrated energy drilling, core drilling, automated mining and tunneling9 Dec 2021US 2021/0381315 A1
- Portable seafloor drill rig for submersible for multi-point core drilling19 Aug 2021US 2021/0254409 A1Hunan University of Science and Technology
- Weed remover21 Jan 2021US 2021/0015020 A1Andre Lafleur RD & D Inc.
Most cited
By later US patents
- Drilling tool with retractable pilot drilling unit100US 5,038,873 ABaker Hughes Incorporated · 1991
- Sonic method and apparatus for installing monitor wells for the surveillance and control of earth contamination64US 4,836,299 A1989
- Apparatus and method for obtaining a core at in situ pressure42US 4,317,490 AThe Texas A&M University System · 1982
- Shrouded core catcher27US 4,605,075 ANorton Christensen, Inc. · 1986
- High-pressure waterjet/abrasive particle-jet coring method and apparatus27US 4,825,963 A1989