H01H 9/042
Explosion-proof cases
Official title: {Explosion-proof cases}
H01H9/042 (Explosion-proof cases) appears on 115 US grants and 98 published applications in this corpus.
Search patents in H01H- Granted patents
- 115
- Published applications
- 98
- Assignees
- 79
- Inventors
- 249
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 1 | 3 |
| 2008 | 1 | 0 |
| 2009 | 0 | 3 |
| 2010 | 2 | 4 |
| 2011 | 1 | 3 |
| 2012 | 4 | 3 |
| 2013 | 4 | 2 |
| 2014 | 1 | 2 |
| 2015 | 3 | 4 |
| 2016 | 3 | 4 |
| 2017 | 2 | 8 |
| 2018 | 2 | 5 |
| 2019 | 12 | 7 |
| 2020 | 2 | 7 |
| 2021 | 5 | 10 |
| 2022 | 10 | 9 |
| 2023 | 9 | 7 |
| 2024 | 8 | 7 |
| 2025 | 6 | 4 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Casing for a temperature-dependent switch and sealed switching device16 Jun 2026US 12,658,389 B2
- Contactor and air conditioning system3 Mar 2026US 12,567,549 B2Xiamen Hongfa Electrical Safety & Controls Co., Ltd.
- Connector and power apparatus case shell10 Feb 2026US 12,550,276 B2Sungrow Power Supply Co., Ltd.
- Relay having a pressure relief valve assembly2 Dec 2025US 12,488,954 B2Xiamen Hongfa Electric Power Controls Co., Ltd.
- Sealing structure for an explosion-proof over-temperature and over-current protector30 Sep 2025US 12,432,864 B2Jpci Controls (Foshan Gaoming) Co., Ltd.
- Circuit breaker11 Jun 2026US 2026/0162914 A1Ellenberger & Poensgen GmbH
- Explosion-proof switch and explosion-proof electrical device19 Feb 2026US 2026/0051444 A1Shenzhen Billda Technology Co., Ltd
- Explosion-proof switch and explosion-proof electrical device19 Feb 2026US 2026/0051445 A1Shenzhen Billda Technology Co., Ltd
- Relay12 Feb 2026US 2026/0045432 A1Xiamen Hongfa Electric Power Controls Co., Ltd.
- Hazardous location compliant circuit protection devices having enhanced safety intelligence, systems and methods4 Sep 2025US 2025/0279249 A1Eaton Intelligent Power Limited
Most cited
By later US patents
- Keyboard with metal cover and improved switches92US 4,771,139 A1988
- Removable magnetic zero/span actuator for a transmitter53US 5,369,386 AElsag International N. V. · 1994
- Explosion proof toggle switch40US 6,040,543 AEGS Electrical Group LLC · 2000
- Explosion proof power supply enclosure for hazardous atmosphere lighting systems39US 5,534,664 AService Machine Company · 1996
- Self-locating, prepositioning actuator for an electrical switch enclosure34US 5,286,935 AAppleton Electric Company · 1994