E21F 5/20
Drawing-off or depositing dust
Official title: Drawing-off or depositing dust ({dust-removing while drilling E21B21/011}; while slitting E21C35/22)
E21F5/20 (Drawing-off or depositing dust) appears on 32 US grants and 16 published applications in this corpus.
Search patents in E21F- Granted patents
- 32
- Published applications
- 16
- Assignees
- 25
- Inventors
- 83
- Latest grant
- 10 Oct 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 4 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 3 |
| 2015 | 0 | 0 |
| 2016 | 4 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 0 | 1 |
| 2021 | 3 | 1 |
| 2022 | 1 | 3 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High-temperature high-efficiency explosion-proof integrated modular dust removal equipment for pyrolysis raw coal gas10 Oct 2023US 11,781,431 B2Guoke Yongji (Beijing) Engineering Installation Co., Ltd.
- Sprayer for settling dust of coal mine8 Nov 2022US 11,492,906 B2Anhui University of Science and Technology
- Dry filter with enhanced separation output and convenient dimensions31 Aug 2021US 11,103,820 B2CFT GmbH Compact Filter Technic
- Absorption-induction convectional dust-controlling/removing air/fog curtain device of fully-mechanized working face and method thereof8 Jun 2021US 11,028,693 B2Shandong University of Science and Technology
- Mine drill, dust suction hood and dust removal device thereof19 Jan 2021US 10,895,120 B2China University of Mining and Technology
- Intelligent automatic coal powder receiving device and method based on prevention and control of rock bursts in coal mines2 Apr 2026US 2026/0092527 A1Shandong University of Science and Technology
- Sprayer for settling dust of coal mine30 Jun 2022US 2022/0205360 A1Anhui University of Science and Technology
- High-temperature high-efficiency explosion-proof integrated modular dust removal equipment for pyrolysis raw coal gas12 May 2022US 2022/0145760 A1Guoke Yongji (Beijing) Engineering Installation Co., Ltd.
- Electronic purification of air in mines13 Jan 2022US 2022/0008936 A1Puriscience Pty Ltd
- Absorption-induction convectional dust-controlling/removing air/fog curtain device of fully-mechanized working face and method thereof18 Feb 2021US 2021/0047927 A1Shandong University of Science and Technology
Most cited
By later US patents
- Filter element support member51US 4,171,963 ADonaldson Company, Inc. · 1979
- Local dust extraction system for an excavation machine51US 9,267,266 B2Vermeer Manufacturing Company · 2016
- Apparatus and method for dust control by condensation enlargement48US 4,497,641 AColorado School of Mines · 1985
- Dust control system and method of operation38US 4,380,353 APeabody Coal Company · 1983
- Blower and dust collecting machine and method of operation28US 4,348,057 AB & J Manufacturing Company · 1982