E21B 25/08
Coating, freezing, consolidating cores
Official title: Coating, freezing, consolidating cores (E21B25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure
E21B25/08 (Coating, freezing, consolidating cores) appears on 109 US grants and 76 published applications in this corpus.
Search patents in E21B- Granted patents
- 109
- Published applications
- 76
- Assignees
- 65
- Inventors
- 220
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 4 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 4 |
| 2003 | 1 | 0 |
| 2004 | 3 | 3 |
| 2005 | 0 | 2 |
| 2006 | 4 | 3 |
| 2007 | 3 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 2 |
| 2010 | 1 | 1 |
| 2011 | 2 | 0 |
| 2012 | 1 | 3 |
| 2013 | 1 | 0 |
| 2014 | 2 | 6 |
| 2015 | 1 | 4 |
| 2016 | 2 | 4 |
| 2017 | 4 | 3 |
| 2018 | 7 | 6 |
| 2019 | 6 | 7 |
| 2020 | 8 | 6 |
| 2021 | 3 | 4 |
| 2022 | 4 | 7 |
| 2023 | 3 | 1 |
| 2024 | 3 | 0 |
| 2025 | 1 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Robust downhole pump barrel12 May 2026US 12,624,691 B2Q2 Artificial Lift Services LLC
- Pressurized reservoir core sample transfer tool system16 Dec 2025US 12,497,849 B2Chevron U.S.A.Inc.
- Method for taking a core sample of a formation15 Oct 2024US 12,116,859 B2Saudi Arabian Oil Company
- High pressure core chamber and experimental vessel23 Apr 2024US 11,965,872 B2ConocoPhillips Company
- Drilling fluid channel structure of core drilling rig2 Jan 2024US 11,859,450 B2Shenzhen University
- Pressure-preserved coring tool, use method, and reservoir analysis method17 Sep 2026US 2026/0275823 A1China National Petroleum Corporation
- Robust Downhole Pump Barrel20 Aug 2026US 2026/0243245 A1Q2 Artificial Lift Services LLC
- Pressure-preserved coring tool, use method, and reservoir analysis method19 Mar 2026US 2026/0078647 A1China National Petroleum Corporation
- Pressurized reservoir core sample transfer tool system12 Mar 2026US 2026/0071510 A1
- Robust downhole pump barrel15 May 2025US 2025/0154945 A1Ravdos Holdings Inc.
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
- Apparatus and method for obtaining a core at in situ pressure42US 4,317,490 AThe Texas A&M University System · 1982
- Method for obtaining pressurized core samples from underpressurized reservoirs41US 4,449,594 AAllied Corporation · 1984
- Method and apparatus for pressure coring with non-invading gel40US 5,482,123 ABaker Hughes Incorporated · 1996