E21B 43/281
Using heat
Official title: {using heat}
E21B43/281 (Using heat) appears on 100 US grants and 69 published applications in this corpus.
Search patents in E21B- Granted patents
- 100
- Published applications
- 69
- Assignees
- 40
- Inventors
- 150
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 9 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 8 |
| 2004 | 0 | 1 |
| 2005 | 4 | 0 |
| 2006 | 7 | 2 |
| 2007 | 0 | 11 |
| 2008 | 2 | 2 |
| 2009 | 11 | 11 |
| 2010 | 1 | 3 |
| 2011 | 2 | 3 |
| 2012 | 5 | 1 |
| 2013 | 4 | 3 |
| 2014 | 4 | 5 |
| 2015 | 3 | 4 |
| 2016 | 5 | 2 |
| 2017 | 1 | 1 |
| 2018 | 2 | 2 |
| 2019 | 2 | 0 |
| 2020 | 0 | 4 |
| 2021 | 1 | 2 |
| 2022 | 0 | 1 |
| 2023 | 3 | 2 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
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
- Modular solution mining system and methods9 Jul 2024US 12,031,421 B2
- Methods for recovering a mineral from a mineral-bearing deposit25 Apr 2023US 11,634,978 B2Canatech Management Services Inc.
- Recovery of copper from heap leach residues4 Apr 2023US 11,618,934 B2Teck Metals Ltd.
- Reverse emulsions for cavity control28 Mar 2023US 11,613,981 B2The Mosaic Company
- Method for coproduction of metals and hydrogen from geological rock formations by injecting aqueous solution1 Jan 2026US 2026/0002429 A1Aramco Services Company
- Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock31 Aug 2023US 2023/0272698 A1Ohio State Innovation Foundation
- Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock16 Feb 2023US 2023/0050823 A1Ohio State Innovation Foundation
- Modular solution mining system and methods8 Sep 2022US 2022/0282607 A1
- Methods for recovering a mineral from a mineral-bearing deposit19 Aug 2021US 2021/0254445 A1Canatech Management Services Inc.
Most cited
By later US patents
- In situ thermal processing of a relatively permeable formation while controlling pressure306US 7,096,942 B1Shell Oil Company · 2006
- Method of in-situ hydrogenation of carbonaceous material299US 4,501,445 ACities Service Company · 1985
- In situ solution mining of coal285US 3,973,628 ANew Mexico Tech Research Foundation · 1976
- Serially burning and pyrolyzing to produce shale oil from a subterranean oil shale269US 3,987,851 AShell Oil Company · 1976
- In situ thermal recovery from a relatively permeable formation with backproduction through a heater wellbore232US 6,964,300 B2Shell Oil Company · 2005