E21C 41/32
Reclamation of surface-mined areas
Official title: Reclamation of surface-mined areas (machines or methods for treating or working soil for agricultural purposes A01B77/00, A01B79/00; machines for back-filling E02F5/22)
E21C41/32 (Reclamation of surface-mined areas) appears on 37 US grants and 28 published applications in this corpus.
Search patents in E21C- Granted patents
- 37
- Published applications
- 28
- Assignees
- 23
- Inventors
- 83
- Latest grant
- 27 Feb 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 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 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 1 | 3 |
| 2005 | 2 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 2 | 2 |
| 2013 | 3 | 1 |
| 2014 | 1 | 2 |
| 2015 | 0 | 5 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 2 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 1 |
| 2023 | 2 | 2 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Ecological reconstructed sponge structure of strip mine dump and application of the same27 Feb 2024US 11,911,813 B2China University of Mining and Technology, Beijing
- Engineered yeast as a method for bioremediation30 Jan 2024US 11,884,566 B2Massachusetts Institute of Technology
- Comprehensive utilization method and test equipment for surface water, goaf and geothermal energy in coal mining subsidence area28 Nov 2023US 11,828,177 B2Shandong University of Science and Technology
- Underground mining method for unexploited coal in boundary open-pit mine21 Nov 2023US 11,821,314 B2China Energy Group Xinjiang Energy Company Ltd
- Process and system for improved reclamation of mined lands13 Jul 2021US 11,060,401 B2
- Tailings storage facility method and structure31 Jul 2025US 2025/0243640 A1Anglo American Technical & Sustainability Services Ltd
- Underground mining method for unexploited coal in boundary open-pit mine27 Jul 2023US 2023/0235667 A1China Energy Group Xinjiang Energy Company Ltd
- Comprehensive utilization method and test equipment for surface water, goaf and geothermal energy in coal mining subsidence area5 Jan 2023US 2023/0003123 A1Shandong University of Science and Technology
- Ecological reconstructed sponge structure of strip mine dump and application of the same11 Aug 2022US 2022/0251954 A1China University of Mining and Technology, Beijing
- Engineered yeast as a method for bioremediation22 Jul 2021US 2021/0221719 A1Massachusetts Institute of Technology
Most cited
By later US patents
- Longwall trench mining system20US 4,017,122 AAcres Consulting Services Limited · 1977
- Method for displacing large blocks of earth17US 4,230,368 A1980
- Method of strip mining15US 4,150,853 A1979
- Method for mining and reclaiming land14US 4,462,713 A1984
- Wall-to-wall surface mining process13US 5,782,539 A1998