E21F 9/00
Devices preventing sparking of machines or apparatus
Official title: Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)
E21F9/00 (Devices preventing sparking of machines or apparatus) appears on 9 US grants and 4 published applications in this corpus.
Search patents in E21F- Granted patents
- 9
- Published applications
- 4
- Assignees
- 7
- Inventors
- 16
- Latest grant
- 25 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 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 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Image capturing assembly25 Mar 2025US 12,262,106 B2Anglo American Steelmaking Coal Pty Ltd
- Conveying system having a spark-detecting device22 Apr 2014US 8,701,873 B2Phoenix Conveyor Belt Systems GmbH
- Pre-start warning system and machine incorporating such system10 Mar 1987US 4,649,288 ADresser U.K. Limited
- Surveillance signal apparatus15 Jul 1986US 4,600,977 A
- Electrical combustion toilet17 Jan 1984US 4,425,671 A
- Image capturing assembly11 Apr 2024US 2024/0121496 A1Anglo American Steelmaking Coal Pty Ltd
- Human interface operating device of an underground mining machine28 Mar 2024US 2024/0102387 A1Caterpillar Inc.
- Coal bed gas well apparatus and method with minable non-sparking tubular and valve components30 Oct 2014US 2014/0318805 A1Halliburton Energy Services.Inc.
- Conveying system having a spark-detecting device24 Oct 2013US 2013/0277177 A1Phoenix Conveyor Belt Systems GmbH
Most cited
By later US patents