E21F 17/103
Dams
Official title: Dams, e.g. for ventilation
E21F17/103 (Dams) appears on 78 US grants and 42 published applications in this corpus.
Search patents in E21F- Granted patents
- 78
- Published applications
- 42
- Assignees
- 46
- Inventors
- 120
- Latest grant
- 7 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 2 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 3 | 1 |
| 2009 | 0 | 4 |
| 2010 | 0 | 0 |
| 2011 | 0 | 3 |
| 2012 | 1 | 2 |
| 2013 | 4 | 1 |
| 2014 | 3 | 2 |
| 2015 | 3 | 2 |
| 2016 | 1 | 4 |
| 2017 | 3 | 1 |
| 2018 | 3 | 3 |
| 2019 | 3 | 2 |
| 2020 | 3 | 4 |
| 2021 | 2 | 2 |
| 2022 | 3 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 1 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions7 Oct 2025US 12,435,631 B2Shandong University of Science and Technology
- Device and method for integrated control of acid wastewater plugging and discharging of abandoned mine5 Mar 2024US 11,920,473 B2Nanchang University
- Fireproof material and fireproof plate, and fireproof wall structure for tunnel and construction method13 Sep 2022US 11,440,845 B2Luyu Royal Gold Building Materials (Heyuan) Co., Ltd
- Jack for installing mine stopping9 Aug 2022US 11,408,285 B2Jack Kennedy Metal Products & Buildings, Inc.
- Sealing system5 Apr 2022US 11,293,285 B2The Secretary of State for Defence
- Filling and support container23 Jul 2026US 2026/0210249 A1Dsi Schaum Chemie Sp.Z O.O.
- Graded underground pumped-storage hydropower in coal mine, construction and using methods12 Mar 2026US 2026/0071604 A1Taiyuan University of Technology
- Graded plugging, monitoring and reinforcing integrated method for separation stratum grouting under single-side open conditions18 Sep 2025US 2025/0290417 A1Shandong University of Science and Technology
- Method of Reducing Risk to Mine Tailings Dams by Controlling Melting Rate of Snow22 Aug 2024US 2024/0280019 A1
- Device and method for integrated control of acid wastewater plugging and discharging of abandoned mine20 Jan 2022US 2022/0018254 A1Nanchang University
Most cited
By later US patents
- Mine brattice52US 3,972,272 ABagby Brattices, Inc. · 1976
- Foam slabs in mine tunnel stoppings33US 4,516,879 AThe Celotex Corporation · 1985
- Heat-responsive duct closing method and apparatus29US 3,990,464 A1976
- Means to seal-off portions of underground mines and the like27US 4,023,372 AOberjuerge Rubber Company · 1977
- Mine stopping and method of and jack for installing same26US 4,483,642 A1984