E21B 43/295
Gasification of minerals
Official title: Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B43/243 takes precedence)
E21B43/295 (Gasification of minerals) appears on 90 US grants and 87 published applications in this corpus.
Search patents in E21B- Granted patents
- 90
- Published applications
- 87
- Assignees
- 74
- Inventors
- 252
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 6 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 2 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 2 |
| 2010 | 0 | 3 |
| 2011 | 2 | 2 |
| 2012 | 1 | 1 |
| 2013 | 2 | 3 |
| 2014 | 0 | 7 |
| 2015 | 3 | 5 |
| 2016 | 4 | 9 |
| 2017 | 1 | 1 |
| 2018 | 5 | 4 |
| 2019 | 3 | 4 |
| 2020 | 2 | 2 |
| 2021 | 5 | 3 |
| 2022 | 4 | 6 |
| 2023 | 4 | 6 |
| 2024 | 6 | 6 |
| 2025 | 5 | 10 |
| 2026 | 3 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock25 Aug 2026US 12,716,336 B2Ohio State Innovation Foundation
- Hydrogen production from iron-rich formations17 Mar 2026US 12,577,865 B1Saudi Arabian Oil Company
- Method for remining residual coal pillar in residual mining area by collaboration of pillar-side backfilling and in-situ gasification10 Mar 2026US 12,571,293 B2Taiyuan University of Technology
- Methods for microbial gas production and use as isotopic tracer7 Oct 2025US 12,435,261 B2University of Wyoming
- Methods and systems for greenhouse gas capture and sequestration12 Aug 2025US 12,385,374 B2Carbon Geocycle, Inc.
- Methods, systems, and apparatuses for in-situ production of compounds via subsurface geothermal chemical reactions17 Sep 2026US 2026/0274694 A1Massachusetts Institute of Technology
- Method for synergistic permeability enhancement and extraction of coal mine gas23 Jul 2026US 2026/0210224 A1Chongqing University
- Systems and methods of oil sweetening and hydrogen production9 Jul 2026US 2026/0193548 A1Saudi Arabian Oil Company
- Systems and methods for producing carbon-free hydrogen9 Jul 2026US 2026/0193971 A1Saudi Arabian Oil Company
- Methods for microbial gas production and use as isotopic tracer8 Jan 2026US 2026/0008952 A1University of Wyoming
Most cited
By later US patents
- Remediation method309US 6,102,622 ABoard of Regents, The University of Texas System · 2000
- Upgrading and mining of coal308US 6,969,123 B2Shell Oil Company · 2005
- Process for the gasification of coal in situ288US 4,087,130 AOccidental Petroleum Corporation · 1978
- Coal gasification method288US 4,243,101 A1981
- Process for in situ coal gasification279US 4,197,911 ARamcor, Inc. · 1980