E21B 43/006
Production of coal-bed methane
Official title: {Production of coal-bed methane (E21B43/243 takes precedence)}
E21B43/006 (Production of coal-bed methane) appears on 302 US grants and 282 published applications in this corpus.
Search patents in E21B- Granted patents
- 302
- Published applications
- 282
- Assignees
- 154
- Inventors
- 596
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 4 | 0 |
| 1995 | 17 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 3 |
| 2002 | 11 | 11 |
| 2003 | 8 | 7 |
| 2004 | 9 | 21 |
| 2005 | 11 | 21 |
| 2006 | 16 | 17 |
| 2007 | 16 | 17 |
| 2008 | 7 | 16 |
| 2009 | 8 | 14 |
| 2010 | 10 | 16 |
| 2011 | 7 | 12 |
| 2012 | 13 | 14 |
| 2013 | 17 | 9 |
| 2014 | 12 | 13 |
| 2015 | 6 | 12 |
| 2016 | 9 | 9 |
| 2017 | 9 | 8 |
| 2018 | 11 | 7 |
| 2019 | 7 | 6 |
| 2020 | 8 | 6 |
| 2021 | 12 | 5 |
| 2022 | 3 | 9 |
| 2023 | 4 | 10 |
| 2024 | 3 | 6 |
| 2025 | 11 | 5 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for coal seam gas seepage displacement, seepage water locking and dust reduction22 Sep 2026US 12,742,389 B2Hunan University of Science and Technology
- Methods and systems for greenhouse gas capture and sequestration28 Jul 2026US 12,692,773 B2Carbon Geocycle, Inc.
- Hydrogen production, storage and recovery16 Jun 2026US 12,655,725 B2TerraH2 LLC
- Enhanced gas extraction system and method based on dual-pulsation and acid fracturing permeability enhancement for low-permeability coal seam9 Jun 2026US 12,650,060 B2Chongqing University
- Controlled shockwave-based stimulation method for coalbed methane (CBM) horizontal well14 Apr 2026US 12,601,242 B1Huainan Mining (Group) Co., Ltd
- Engineering bionic experimental system and method for evaluating adaptive borehole plugging effect based on nmr24 Sep 2026US 2026/0286832 A1Taiyuan University of Technology
- System and method for coupling geothermal energy storage with coalbed methane extraction in unmineable coalbed6 Aug 2026US 2026/0226814 A1China University of Geosciences (Wuhan)
- Method for synergistic permeability enhancement and extraction of coal mine gas23 Jul 2026US 2026/0210224 A1Chongqing University
- Multifactorial optimization method for deep coal and rock gas pressure return nozzles21 May 2026US 2026/0139574 A1Southwest Petroleum University
- Enhanced gas extraction system and method based on dual-pulsation and acid fracturing permeability enhancement for low-permeability coal seam23 Apr 2026US 2026/0110236 A1Chongqing University
Most cited
By later US patents
- Process for recovering methane and/or sequestering fluids405US 6,412,559 B1Alberta Research Council · 2002
- Coalbed methane drilling359US 5,411,104 AConoco Inc. · 1995
- Producing methane from coal in situ351US 4,089,374 AIn Situ Technology, Inc. · 1978
- Upgrading and mining of coal308US 6,969,123 B2Shell Oil Company · 2005
- Method for producing methane-containing gaseous mixtures305US 5,388,645 AAmoco Corporation · 1995