E21B 43/243
Combustion in situ
E21B43/243 (Combustion in situ) appears on 967 US grants and 555 published applications in this corpus.
Search patents in E21B- Granted patents
- 967
- Published applications
- 555
- Assignees
- 226
- Inventors
- 1,036
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 26 | 0 |
| 1977 | 50 | 0 |
| 1978 | 61 | 0 |
| 1979 | 38 | 0 |
| 1980 | 54 | 0 |
| 1981 | 46 | 0 |
| 1982 | 26 | 0 |
| 1983 | 38 | 0 |
| 1984 | 56 | 0 |
| 1985 | 25 | 0 |
| 1986 | 15 | 0 |
| 1987 | 17 | 0 |
| 1988 | 9 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 9 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 74 |
| 2003 | 7 | 56 |
| 2004 | 45 | 8 |
| 2005 | 31 | 9 |
| 2006 | 43 | 8 |
| 2007 | 7 | 29 |
| 2008 | 8 | 32 |
| 2009 | 17 | 32 |
| 2010 | 30 | 37 |
| 2011 | 18 | 21 |
| 2012 | 35 | 10 |
| 2013 | 22 | 28 |
| 2014 | 17 | 31 |
| 2015 | 15 | 36 |
| 2016 | 25 | 20 |
| 2017 | 20 | 15 |
| 2018 | 18 | 11 |
| 2019 | 16 | 19 |
| 2020 | 12 | 12 |
| 2021 | 14 | 14 |
| 2022 | 13 | 13 |
| 2023 | 11 | 9 |
| 2024 | 11 | 14 |
| 2025 | 13 | 13 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Boosting well performance in geothermal systems15 Sep 2026US 12,735,966 B2Schlumberger Technology Corporation
- Fluid injection for dehydrogenation14 Apr 2026US 12,601,243 B2Saudi Arabian Oil Company
- Manipulation of fluids, fluid components and reactions in microfluidic systems31 Mar 2026US 12,590,508 B2Brandeis University
- Methods of generating hydrogen in high-temperature, tight subterranean formations10 Mar 2026US 12,571,290 B2Halliburton Energy Services.Inc.
- Systems and methods of initiating energetic reactions for reservoir stimulation24 Feb 2026US 12,560,066 B2Schlumberger Technology Corporation
- Manipulation of fluids, fluid components and reactions in microfluidic systems10 Sep 2026US 2026/0264083 A1Brandeis University
- Method for synergistic permeability enhancement and extraction of coal mine gas23 Jul 2026US 2026/0210224 A1Chongqing University
- System and method for enhanced geothermal energy extraction16 Jul 2026US 2026/0201783 A1Hunt Energy, L.L.C.
- Underground coal gasification and associated systems and methods4 Dec 2025US 2025/0369332 A1Ergo Exergy Technologies Inc.
- Systems and methods for hydrogen production from an underground formation4 Dec 2025US 2025/0369333 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Hydrologic cells for recovery of hydrocarbons or thermal energy from coal, oil-shale, tar-sands and oil-bearing formations387US 5,868,202 ATarim Associates for Scientific Mineral and Oil Exploration AG · 1999
- Recovery of hydrocarbons from coal377US 3,999,607 AExxon Research & Engineering Co. · 1976
- Apparatus and method for the recovery of fuel products from subterranean deposits of carbonaceous matter using a plasma arc377US 4,067,390 ATechnology Application Services Corporation · 1978
- Method and apparatus for conversion of coal in situ366US 4,776,638 AUniversity of Kentucky Research Foundation · 1988
- Extraction of hydrocarbons in situ from underground hydrocarbon deposits362US 4,008,762 A1977