H02H 3/34
Of a three-phase system
Official title: of a three-phase system
H02H3/34 (Of a three-phase system) appears on 184 US grants and 124 published applications in this corpus.
Search patents in H02H- Granted patents
- 184
- Published applications
- 124
- Assignees
- 114
- Inventors
- 355
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 6 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 7 | 0 |
| 1981 | 2 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 3 | 2 |
| 2004 | 2 | 2 |
| 2005 | 0 | 4 |
| 2006 | 3 | 4 |
| 2007 | 5 | 6 |
| 2008 | 5 | 4 |
| 2009 | 3 | 1 |
| 2010 | 3 | 9 |
| 2011 | 5 | 3 |
| 2012 | 3 | 5 |
| 2013 | 5 | 5 |
| 2014 | 2 | 4 |
| 2015 | 5 | 3 |
| 2016 | 2 | 7 |
| 2017 | 4 | 3 |
| 2018 | 5 | 9 |
| 2019 | 8 | 4 |
| 2020 | 3 | 9 |
| 2021 | 7 | 7 |
| 2022 | 6 | 7 |
| 2023 | 12 | 7 |
| 2024 | 6 | 5 |
| 2025 | 3 | 6 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for checking the adequacy at the residual currents of differential circuit breakers18 Aug 2026US 12,712,355 B2Chauvin Arnoux
- Electronic switching protection apparatus without generating an electric arc17 Mar 2026US 12,580,379 B2Hager Electro
- Devices for monitoring and protecting power circuits7 Oct 2025US 12,438,356 B2Safran Electrical & Power
- Fault classification and zone identification in a power transmission system15 Apr 2025US 12,278,472 B2Hitachi Energy Ltd
- Circuit interrupting device for providing ground fault and open neutral protection in temporary power applications7 Jan 2025US 12,191,653 B2Hubbell Incorporated
- Ground fault circuit interrupter and detection method for the same6 Aug 2026US 2026/0229870 A1Schneider Electric Industries SAS
- New energy power station grounding protection system, method, electronic device, and storage medium6 Aug 2026US 2026/0229871 A1Shanxi Yingrun New Energy Co., Ltd
- Circuit breaker device and method2 Jul 2026US 2026/0188994 A1Siemens Aktiengesellschaft
- Fault type identification method in electrical power system21 May 2026US 2026/0142452 A1Hitachi Energy Ltd
- Protection apparatus for protecting a surge protection device22 Jan 2026US 2026/0024715 A1Citel
Most cited
By later US patents
- Solid-state trip device for a protective circuit breaker of a three-phase mains system, enabling the type of fault to be detected82US 5,077,627 AMerlin Gerin · 1991
- Circuit interrupter apparatus with a selectable display means56US 4,827,369 AWestinghouse Electric Corp. · 1989
- Fault detector for a three-phase alternating current supply51US 4,751,653 AAmerican Standard Inc. · 1988
- Fault type selection system for identifying faults in an electric power system50US 6,525,543 B1Schweitzer Engineering Laboratories, Inc. · 2003
- Leakage current protection device adapted to a wide variety of domestic and international applications48US 6,381,113 B1Technology Research Corporation · 2002