E21F 16/00
Drainage
Official title: Drainage (keeping dry foundation sites or other areas in the ground E02D19/00)
E21F16/00 (Drainage) appears on 34 US grants and 27 published applications in this corpus.
Search patents in E21F- Granted patents
- 34
- Published applications
- 27
- Assignees
- 39
- Inventors
- 138
- Latest grant
- 17 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 2 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 2 |
| 2016 | 1 | 2 |
| 2017 | 3 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 2 | 1 |
| 2021 | 0 | 0 |
| 2022 | 2 | 5 |
| 2023 | 4 | 4 |
| 2024 | 7 | 1 |
| 2025 | 0 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mining method without coal pillars with roof-cutting and roadway retaining17 Dec 2024US 12,168,931 B2China University of Mining and Technology, Beijing
- Method for dewatering coal mine goaf by crossing neighboring goaf19 Nov 2024US 12,146,410 B1Huainan Mining (Group) Co., Ltd
- Tracer diffusion device, system for tracing development of water conducting fracture zone and relataed method17 Sep 2024US 12,091,971 B2China Univeristy of Mining and Technology, Beijing
- Blockage-proof water diversion and drainage devices for highway tunnel construction10 Sep 2024US 12,084,973 B1Northwest Institute of Eco-Environment and Resources, Cas
- Flood protection for underground air vents2 Apr 2024US 11,946,376 B2Floodbreak, L.L.C.
- Safe mining method for water-rich gently inclined coal seam3 Sep 2026US 2026/0258725 A1China University of Mining and Technology
- Method for constructing artificial water-conducting channel through pulse hydraulic fracturing of drainage boreholes in roof aquifer20 Nov 2025US 2025/0354488 A1China University of Mining and Technology
- Tracer diffusion device, system for tracing development of water conducting fracture zone and relataed method2 May 2024US 2024/0141783 A1China University of Mining and Technology, Beijing
- Mining Method Without Coal Pillars With Roof-Cutting And Roadway Retaining17 Aug 2023US 2023/0258083 A1China University of Mining and Technology, Beijing
- Brine Extraction Well System20 Jul 2023US 2023/0228194 A1Genesis Alkali Wyoming, LP
Most cited
By later US patents
- Process for making silicon carbide reinforced silicon carbide composite57US 5,840,221 ASaint-Gobain/Norton Industrial Ceramics Corporation · 1998
- Silicon carbide reinforced silicon carbide composite33US 6,245,424 B1Saint-Gobain Industrial Ceramics, Inc. · 2001
- Waterproof cladding construction and method of providing the same15US 6,761,504 B1MBT Holding AG · 2004
- Insulating tunnel liner system10US 5,470,178 A1995
- Method for dewatering a subterranean formation via a borehole7US 4,349,228 AConsolidation Coal Company · 1982