H01H 33/56
Gas reservoirs
H01H33/56 (Gas reservoirs) appears on 335 US grants and 295 published applications in this corpus.
Search patents in H01H- Granted patents
- 335
- Published applications
- 295
- Assignees
- 139
- Inventors
- 842
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 7 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 4 |
| 2002 | 11 | 10 |
| 2003 | 8 | 5 |
| 2004 | 5 | 6 |
| 2005 | 4 | 4 |
| 2006 | 3 | 6 |
| 2007 | 7 | 4 |
| 2008 | 2 | 4 |
| 2009 | 2 | 4 |
| 2010 | 4 | 5 |
| 2011 | 2 | 9 |
| 2012 | 7 | 7 |
| 2013 | 4 | 8 |
| 2014 | 9 | 17 |
| 2015 | 9 | 12 |
| 2016 | 14 | 11 |
| 2017 | 8 | 18 |
| 2018 | 22 | 24 |
| 2019 | 18 | 19 |
| 2020 | 18 | 11 |
| 2021 | 18 | 17 |
| 2022 | 10 | 27 |
| 2023 | 9 | 19 |
| 2024 | 23 | 20 |
| 2025 | 16 | 15 |
| 2026 | 7 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01H 2033/566Avoiding the use of sf6Indexing code89
- H01H 33/563Comprising means for monitoring the density of the insulating gas59
- H01H 33/565Gas-tight sealings for moving parts penetrating into the reservoir46
- H01H 33/562Means for avoiding liquefaction or for disposing of liquefaction products29
- H01H 33/561Composed of different independent pressurised compartments put in communication only after their18
- H01H 2033/568With overpressure releaseIndexing code14
- H01H 2033/567Detection of decomposition products of the gasIndexing code13
Recent patents
- Method and apparatus for gas leak detection18 Aug 2026US 12,710,334 B2ABB Schweiz AG
- Compression sealing gasket and sealing system5 May 2026US 12,618,472 B2GE Vernova Infrastructure Technology LLC
- Gas monitoring system and respective method17 Feb 2026US 12,555,729 B2Hitachi Energy Ltd
- Method for determining a gas quantity in an insulated switchgear10 Feb 2026US 12,546,678 B2Schneider Electric Industries SAS
- Vacuum circuit breaker10 Feb 2026US 12,548,721 B2Mitsubishi Electric Corporation
- Simulation verification method and apparatus for gas density relay27 Aug 2026US 2026/0251713 A1Shanghai Roye Electric Co., Ltd.
- Vacuum circuit breaker6 Aug 2026US 2026/0229431 A1Hd Hyundai Electric Co., Ltd.
- Method for distributing a mixture in a gaseous state30 Jul 2026US 2026/0218856 A1Air Liquide Electronics Systems
- Circuit breaker device28 May 2026US 2026/0148916 A1Kabushiki Kaisha Toshiba
- A circuit breaker30 Apr 2026US 2026/0120985 A1Hitachi Energy Ltd
Most cited
By later US patents
- Subsea switchgear95US 9,450,385 B2Siemens Aktiengesellschaft · 2016
- Gas insulated high-voltage circuit breaker with pneumatic operating mechanism84US 5,187,339 AMerlin Gerin · 1993
- Recloser means for reclosing interrupted high voltage electric circuit means66US 5,175,403 ACooper Power Systems, Inc. · 1992
- Modular, high-voltage, three phase recloser assembly54US 6,198,062 B1Joslyn Hi-Voltage Corporation · 2001
- Diaphragm seal for a high voltage switch environment48US 5,667,060 AAmerace Corporation · 1997