H01H 33/668
Means for obtaining or monitoring the vacuum
H01H33/668 (Means for obtaining or monitoring the vacuum) appears on 82 US grants and 60 published applications in this corpus.
Search patents in H01H- Granted patents
- 82
- Published applications
- 60
- Assignees
- 38
- Inventors
- 199
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 2 |
| 2002 | 4 | 2 |
| 2003 | 1 | 2 |
| 2004 | 0 | 4 |
| 2005 | 4 | 2 |
| 2006 | 1 | 4 |
| 2007 | 3 | 1 |
| 2008 | 2 | 5 |
| 2009 | 2 | 1 |
| 2010 | 2 | 3 |
| 2011 | 1 | 2 |
| 2012 | 1 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 2 | 3 |
| 2016 | 0 | 2 |
| 2017 | 2 | 3 |
| 2018 | 3 | 1 |
| 2019 | 2 | 1 |
| 2020 | 2 | 1 |
| 2021 | 0 | 2 |
| 2022 | 1 | 4 |
| 2023 | 3 | 4 |
| 2024 | 2 | 2 |
| 2025 | 5 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Vacuum circuit breaker10 Feb 2026US 12,548,721 B2Mitsubishi Electric Corporation
- Pressure pulse diagnostics of an OLTC11 Nov 2025US 12,469,653 B2Hitachi Energy Ltd
- Inline disconnect for multiphase electric utility line applications26 Aug 2025US 12,400,812 B2Southern Electrical Equipment Company
- Vacuum circuit breaker5 Aug 2025US 12,381,053 B2Ls Electric Co., Ltd.
- Vacuum degree detection device, monitoring system, and vacuum arc extinguishing chamber thereof17 Jun 2025US 12,334,287 B2Xi' An Jiaotong University
- Vacuum Monitored Disconnect Switch26 Feb 2026US 2026/0058079 A1Southern States, LLC
- Power Switching Device with Self Diagnostic Capability8 Jan 2026US 2026/0011512 A1TE Connectivity Solutions GmbH
- A vacuum interrupter, a transformer arrangement and a method for monitoring vacuum interrupter8 Jan 2026US 2026/0011514 A1Hitachi Energy Ltd
- Load break disconnect for group operated multi-phase switches6 Nov 2025US 2025/0343016 A1Southern Electrical Equipment Company
- Pressure pulse diagnostics of an oltc29 May 2025US 2025/0174416 A1Hitachi Energy Ltd
Most cited
By later US patents
- Vacuum circuit-breaker equipped with self-diagnosis means44US 5,286,933 AGEC Alsthom SA · 1994
- Apparatus for protecting vacuum interrupter type on-line tap changer39US 4,388,664 AFuji Electric Co., Ltd. · 1983
- Circuit breaker arrangement with integrated protection, control and monitoring38US 6,295,190 B1Electric Boat Corporation · 2001
- Leak sensor and indicating system for vacuum circuit interrupters36US 4,103,291 A1978
- Vacuum circuit interrupter with on-line vacuum monitoring apparatus33US 4,440,995 AWestinghouse Electric Corp. · 1984