E21B 25/16
Apparatus for obtaining or removing undisturbed cores: for obtaining oriented cores
Official title: for obtaining oriented cores
E21B25/16 (Apparatus for obtaining or removing undisturbed cores: for obtaining oriented cores) appears on 72 US grants and 78 published applications in this corpus.
Search patents in E21B- Granted patents
- 72
- Published applications
- 78
- Assignees
- 44
- Inventors
- 135
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 1 | 0 |
| 2009 | 1 | 2 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 6 |
| 2013 | 2 | 3 |
| 2014 | 1 | 8 |
| 2015 | 2 | 8 |
| 2016 | 4 | 2 |
| 2017 | 3 | 3 |
| 2018 | 3 | 6 |
| 2019 | 4 | 5 |
| 2020 | 3 | 4 |
| 2021 | 4 | 3 |
| 2022 | 6 | 5 |
| 2023 | 5 | 6 |
| 2024 | 4 | 3 |
| 2025 | 1 | 3 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Devices for marking a core sample25 Aug 2026US 12,716,309 B2Imdex Technologies Pty Ltd
- Method and system for enabling acquisition of borehole survey data and core orientation data18 Aug 2026US 12,709,955 B2Reflex Instruments Asia Pacific Pty Ltd
- Device and system for orienting core samples10 Feb 2026US 12,546,210 B2Stockholm Precision Tools, S.L.
- Core barrel head assembly with an integrated sample orientation tool and system for using same11 Nov 2025US 12,467,329 B2Globaltech Corporation Pty Ltd
- Method and system for enabling at surface core orientation data transfer12 Nov 2024US 12,140,018 B2Relex Instruments Asia Pacific Pty Ltd
- Data capture device, system & method23 Jul 2026US 2026/0210238 A1
- Method and system for determining core orientation16 Jul 2026US 2026/0201793 A1
- Core barrel head assembly with an integrated sample orientation tool and system for using same5 Mar 2026US 2026/0063010 A1
- Devices for marking a core sample7 Aug 2025US 2025/0250874 A1Imdex Technologies Pty Ltd
- Device and system for orienting core samples20 Feb 2025US 2025/0059881 A1Stockholm Precision Tools, S.L.
Most cited
By later US patents
- Bit-stabilized combination coring and drilling system142US 5,568,838 ABaker Hughes Incorporated · 1996
- Method and apparatus for simultaneous coring and formation evaluation80US 6,006,844 ABaker Hughes Incorporated · 1999
- Orientation device for a core sample38US 7,296,638 B22iC Australia Pty Ltd · 2007
- Core drilling tool35US 4,955,438 AEastman Christensen Company · 1990
- Core marking system for a sidewall coring tool32US 5,310,013 ASchlumberger Technology Corporation · 1994