E21F 15/00
Methods or devices for placing filling-up materials in underground workings
Official title: Methods or devices for placing filling-up materials in underground workings (dams E21F17/103 {; chocks made of flexible containers filled with backfilling material E21D15/483})
E21F15/00 (Methods or devices for placing filling-up materials in underground workings) appears on 147 US grants and 120 published applications in this corpus.
Search patents in E21F- Granted patents
- 147
- Published applications
- 120
- Assignees
- 108
- Inventors
- 424
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 3 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 2 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 3 |
| 2009 | 0 | 2 |
| 2010 | 3 | 1 |
| 2011 | 0 | 4 |
| 2012 | 1 | 3 |
| 2013 | 4 | 5 |
| 2014 | 2 | 3 |
| 2015 | 2 | 4 |
| 2016 | 2 | 4 |
| 2017 | 3 | 6 |
| 2018 | 7 | 7 |
| 2019 | 5 | 9 |
| 2020 | 8 | 13 |
| 2021 | 9 | 13 |
| 2022 | 5 | 3 |
| 2023 | 9 | 13 |
| 2024 | 8 | 10 |
| 2025 | 6 | 4 |
| 2026 | 5 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High-concentration filling slurry of coal gangue and preparation method thereof9 Jun 2026US 12,649,887 B1Taiyuan University of Science and Technology
- Automated method and processing train for lining tunnels21 Apr 2026US 12,607,122 B2Hinfra S.R. L.
- 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
- Method for recovering residual coal pillars by Freezing water accumulated in room-and-pillar mining area10 Mar 2026US 12,571,308 B2Taiyuan University of Technology
- Combined process of integrating stoping-backfilling and carbon storage13 Jan 2026US 12,523,152 B2Taiyuan University of Technology
- Backfill material30 Jul 2026US 2026/0218614 A1Sika Technology AG
- Minimization of rock pile leachate formation and methods of treating rock pile leachates16 Jul 2026US 2026/0199941 A1Heritage Research Group
- Methods, devices, and storage medium for synchronous treatment of water hazard and subsidence25 Jun 2026US 2026/0176970 A1China University of Mining and Technology, Beijing
- High-concentration filling slurry of coal gangue and preparation method thereof11 Jun 2026US 2026/0159773 A1Taiyuan University of Science and Technology
- Method of filling abandoned mineshaft and concurrently mineralizing and sequestering co2 using solid waste slurries11 Jun 2026US 2026/0160165 A1Shanxi University
Most cited
By later US patents
- Coal gasification method288US 4,243,101 A1981
- Minimizing subsidence effects during production of coal in situ145US 4,463,807 AIn Situ Technology, Inc. · 1984
- Minimizing subsidence effects during production of coal in situ144US 4,448,252 AIn Situ Technology, Inc. · 1984
- Binder for mine tailings75US 6,402,833 B1Lafarge Canada Inc. · 2002
- System and method for aggregate disposal65US 8,366,349 B2Beachner Construction Company, Inc. · 2013