E21B 25/12
Of the sliding wedge type
Official title: of the sliding wedge type
E21B25/12 (Of the sliding wedge type) appears on 11 US grants and 9 published applications in this corpus.
Search patents in E21B- Granted patents
- 11
- Published applications
- 9
- Assignees
- 10
- Inventors
- 23
- Latest grant
- 19 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 0 |
| 2017 | 1 | 2 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Core barrel sealing structure capable of increasing sealing-specific pressure19 Sep 2023US 11,761,283 B2Shenzhen University
- Core lifter7 Apr 2020US 10,612,308 B2Bly IP Inc.
- Apparatus and method for withdrawing cores from drilled holes1 Oct 2019US 10,428,612 B2
- Coring tools and related methods21 Mar 2017US 9,598,911 B2Baker Hughes Incorporated
- Core lifter8 Jul 2014US 8,770,320 B2Longyear TM, Inc.
- Core barrel sealing structure capable of increasing sealing-specific pressure7 Jul 2022US 2022/0213750 A1Shenzhen University
- Apparatus and method for withdrawing cores from drilled holes12 Oct 2017US 2017/0292340 A1
- Core lifter5 Oct 2017US 2017/0284160 A1Bly IP Inc.
- Coring tools and related methods12 Nov 2015US 2015/0322722 A1Baker Hughes Incorporated
- Core Lifter Assembly3 Sep 2015US 2015/0247369 A1CT Tech Pty Ltd
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
- Multipurpose fluid flow assisted downhole tool42US 4,296,822 AOmega Tools International · 1981
- Externally powered core catcher13US 4,552,229 ANorton Christensen, Inc. · 1985
- Core catcher for use with an hydraulically displaced inner tube in a coring tool9US 4,651,835 AEastman Christensen Company · 1987
- Core sampler8US 6,116,358 ABaroid Technology, Inc. · 2000