H01H 47/002
Monitoring or fail-safe circuits
Official title: {Monitoring or fail-safe circuits}
H01H47/002 (Monitoring or fail-safe circuits) appears on 855 US grants and 803 published applications in this corpus.
Search patents in H01H- Granted patents
- 855
- Published applications
- 803
- Assignees
- 427
- Inventors
- 1,770
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 10 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 11 | 0 |
| 1994 | 15 | 0 |
| 1995 | 12 | 0 |
| 1996 | 13 | 0 |
| 1997 | 6 | 0 |
| 1998 | 15 | 0 |
| 1999 | 12 | 0 |
| 2000 | 11 | 0 |
| 2001 | 13 | 2 |
| 2002 | 8 | 8 |
| 2003 | 17 | 14 |
| 2004 | 12 | 6 |
| 2005 | 4 | 16 |
| 2006 | 10 | 16 |
| 2007 | 15 | 17 |
| 2008 | 12 | 21 |
| 2009 | 16 | 18 |
| 2010 | 9 | 17 |
| 2011 | 16 | 15 |
| 2012 | 13 | 21 |
| 2013 | 13 | 28 |
| 2014 | 12 | 31 |
| 2015 | 29 | 32 |
| 2016 | 30 | 46 |
| 2017 | 41 | 49 |
| 2018 | 43 | 66 |
| 2019 | 67 | 63 |
| 2020 | 51 | 50 |
| 2021 | 74 | 54 |
| 2022 | 42 | 56 |
| 2023 | 50 | 50 |
| 2024 | 47 | 43 |
| 2025 | 44 | 36 |
| 2026 | 21 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01H 47/004Using plural redundant serial connected relay operated contacts in controlled circuit134
- H01H 2047/003Detecting welded contacts and applying weld break pulses to coilIndexing code61
- H01H 2047/006Detecting unwanted movement of contacts and applying pulses to coil for restoringIndexing code29
Recent patents
- Method to detect back-feed and mis-wiring events by a UPS system18 Aug 2026US 12,712,380 B2Schneider Electric It Corporation
- Mini automatic transfer switch11 Aug 2026US 12,706,476 B2
- Electromechanical relay and monitoring switch for an electromechanical relay4 Aug 2026US 12,700,556 B2TE Connectivity Solutions GmbH
- In-vehicle control device21 Jul 2026US 12,686,275 B2Mitsubishi Jidosha Kogyo Kabushiki Kaisha
- Manually resettable switch apparatus7 Jul 2026US 12,676,272 B2Phoenix Contact GmbH & Co.KG
- Systems and methods for verifying protective relay output contact operation10 Sep 2026US 2026/0269160 A1Schweitzer Engineering Laboratories, Inc.
- Power supply device13 Aug 2026US 2026/0233616 A1Toyota Jidosha Kabushiki Kaisha
- Relay Control Apparatus and Method6 Aug 2026US 2026/0229433 A1LG Energy Solution, Ltd.
- Relay Control Apparatus and Method6 Aug 2026US 2026/0229619 A1LG Energy Solution, Ltd.
- Relay Control Apparatus and Method30 Jul 2026US 2026/0221360 A1LG Energy Solution, Ltd.
Most cited
By later US patents
- Fail safe fault interrupter144US 6,262,871 B1X-L Synergy · 2001
- Thermostat with load activation detection feature104US 6,089,310 AEmerson Electric Co. · 2000
- Electromechanical relays95US 5,604,656 AJ. H. Fenner & Co. Limited · 1997
- Zero cross relay actuation method and system implementing same77US 6,233,132 B1Ranco Incorporated of Delaware · 2001
- Control panel power enabling and disabling system for aerial work platforms73US 5,021,917 AKidde Industries, Inc. · 1991