H01H 33/68
Liquid-break switches
Official title: Liquid-break switches, e.g. oil-break
H01H33/68 (Liquid-break switches) appears on 30 US grants and 21 published applications in this corpus.
Search patents in H01H- Granted patents
- 30
- Published applications
- 21
- Assignees
- 24
- Inventors
- 91
- Latest grant
- 23 Jan 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 2 | 2 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 2 |
| 2014 | 1 | 1 |
| 2015 | 3 | 2 |
| 2016 | 1 | 3 |
| 2017 | 1 | 0 |
| 2018 | 0 | 3 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Transformer comprising a load break rotary switch23 Jan 2024US 11,881,372 B2Hitachi Energy Ltd
- Arc extinguishing systems5 Dec 2023US 11,837,420 B2Siemens Aktiengesellschaft
- Liquid arc extinguish chamber for direct current breaking, direct current breaker and method thereof13 Sep 2022US 11,443,909 B2Xi' An Jiaotong University
- Intra-tank under-oil vacuum primary switches for medium voltage transformer applications16 Jun 2020US 10,685,778 B2Carte International Inc.
- Quickly closing switch element20 Aug 2019US 10,388,475 B2Siemens Aktiengsellschaft
- Transformer comprising a load break rotary switch2 Nov 2023US 2023/0352251 A1Hitachi Energy Switzerland AG
- Arc extinguishing systems9 Jun 2022US 2022/0181106 A1Siemens Aktiengesellschaft
- Liquid arc extinguish chamber for direct current breaking, direct current breaker and method thereof29 Oct 2020US 2020/0343063 A1Xi' An Jiaotong University
- Intra-tank under-oil vacuum primary switches for medium voltage transformer applications18 Oct 2018US 2018/0301279 A1Carte International Inc.
- Electrical system and electrical switching apparatus therefor11 Oct 2018US 2018/0294123 A1Cooper Technologies Company
Most cited
By later US patents
- Vapor-cooled terminal-bushings for oil-type circuit-interrupters24US 4,123,618 AWestinghouse Electric Corp. · 1978
- Motorized loadbreak switch control system and method24US 7,432,787 B2Cooper Technologies Company · 2008
- Circuit breaker with unitary actuating shaft23US 4,412,116 AWestinghouse Electric Corp. · 1983
- High-voltage loadbreak switch with enhanced arc suppression22US 6,797,909 B2McGraw-Edison Company · 2004
- Make-before-break selector switch17US 6,825,426 B2McGraw-Edison Company · 2004