H02H 3/26
Responsive to difference between voltages or between currents
Official title: responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
H02H3/26 (Responsive to difference between voltages or between currents) appears on 1,698 US grants and 1,404 published applications in this corpus.
Search patents in H02H- Granted patents
- 1,698
- Published applications
- 1,404
- Assignees
- 642
- Inventors
- 2,583
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 40 | 0 |
| 1977 | 34 | 0 |
| 1978 | 25 | 0 |
| 1979 | 14 | 0 |
| 1980 | 20 | 0 |
| 1981 | 13 | 0 |
| 1982 | 22 | 0 |
| 1983 | 13 | 0 |
| 1984 | 6 | 0 |
| 1985 | 10 | 0 |
| 1986 | 14 | 0 |
| 1987 | 11 | 0 |
| 1988 | 10 | 0 |
| 1989 | 13 | 0 |
| 1990 | 10 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 15 | 0 |
| 1994 | 14 | 0 |
| 1995 | 15 | 0 |
| 1996 | 18 | 0 |
| 1997 | 14 | 0 |
| 1998 | 21 | 0 |
| 1999 | 32 | 0 |
| 2000 | 19 | 0 |
| 2001 | 23 | 5 |
| 2002 | 29 | 32 |
| 2003 | 42 | 34 |
| 2004 | 43 | 48 |
| 2005 | 28 | 32 |
| 2006 | 28 | 35 |
| 2007 | 42 | 46 |
| 2008 | 32 | 47 |
| 2009 | 37 | 40 |
| 2010 | 36 | 61 |
| 2011 | 48 | 42 |
| 2012 | 35 | 53 |
| 2013 | 49 | 67 |
| 2014 | 44 | 64 |
| 2015 | 56 | 46 |
| 2016 | 51 | 66 |
| 2017 | 56 | 72 |
| 2018 | 56 | 81 |
| 2019 | 78 | 61 |
| 2020 | 84 | 78 |
| 2021 | 84 | 69 |
| 2022 | 66 | 56 |
| 2023 | 63 | 90 |
| 2024 | 65 | 64 |
| 2025 | 66 | 63 |
| 2026 | 38 | 52 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H02H 3/32Involving comparison of the voltage or current values at corresponding points in1,337
- H02H 3/28Involving comparison of the voltage or current values at two spaced portions288
- H02H 3/265Responsive to phase angle between voltages or between currents37
- H02H 3/36Involving comparison of the voltage or current values at corresponding points of23
Recent patents
- Self-test auto monitor ground fault circuit interrupter (GFCI) with power denial6 Oct 2026US 12,754,232 B2Hubbell Incorporated
- Ground fault detection in AC systems using digital signal processing6 Oct 2026US 12,756,175 B2Amber Semiconductor, Inc.
- Power supply system, power conditioning apparatus, and power conditioning system22 Sep 2026US 12,744,372 B2Huawei Digital Power Technologies Co., Ltd.
- Leakage protection circuit and lighting system1 Sep 2026US 12,726,013 B2Silergy Semiconductor Technology (Hangzhou) LTD
- Current transformer sensing with saturation protection25 Aug 2026US 12,719,260 B2Hamilton Sundstrand Corporation
- Constant current startup regulator for fault managed power24 Sep 2026US 2026/0291203 A1Cisco Technology, Inc.
- Method for processing a current transformer signal24 Sep 2026US 2026/0291210 A1Schneider Electric Industries SAS
- Fault response control in power converters3 Sep 2026US 2026/0261113 A1
- Leakage protection device and electrical device27 Aug 2026US 2026/0253828 A1Sensata Technologies Changzhou Co., Ltd.
- System for power line differential protection27 Aug 2026US 2026/0254241 A1Hitachi Energy Ltd
Most cited
By later US patents
- Electronic circuit breaker with protection against sputtering arc faults and ground faults252US 5,224,006 AWestinghouse Electric Corp. · 1993
- Apparatus and method of detecting ground fault in power conversion system248US 6,927,955 B2Canon Kabushiki Kaisha · 2005
- Circuit breaker panel241US 8,681,463 B2Edison Global Circuits, LLC · 2014
- Arc fault detector with circuit interrupter222US 6,433,978 B1Leviton Manufacturing Co., Inc. · 2002
- Self testing circuit breaker ground fault and sputtering arc trip unit204US 5,459,630 AEaton Corporation · 1995