System for controlling operation of a contactor using a high side sense circuit and a low side sense circuit
US-2017365430-A1 · Dec 21, 2017 · US
Monitoring or fail-safe circuits (for relays H01H47/002)
Monitoring or fail-safe circuits (for relays H01H47/002) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F7/1844 |
| Official title | {Monitoring or fail-safe circuits (for relays H01H47/002)} |
| Display label | Monitoring or fail-safe circuits (for relays H01H47/002) |
| Total patents | 407 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 24 |
| 2016 | 26 |
| 2017 | 32 |
| 2018 | 39 |
| 2019 | 52 |
| 2020 | 49 |
| 2021 | 36 |
| 2022 | 50 |
| 2023 | 35 |
| 2024 | 41 |
| 2025 | 21 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Testing a solenoid of a directional control valve
US-9828821-B2 · Nov 28, 2017 · US
Parameter estimation in an actuator
US-9777660-B2 · Oct 3, 2017 · US
Solenoid testing system
US-2017234770-A1 · Aug 17, 2017 · US
Magnetic coil driving circuit for magnetic contactor
US-2017222428-A1 · Aug 3, 2017 · US
Voice coil having epoxy-bound winding layers
US-2017223463-A1 · Aug 3, 2017 · US
Detection of a plunger position in an irrigation control device
US-2017167630-A1 · Jun 15, 2017 · US
Electromagnetic-valve controller
US-9653200-B2 · May 16, 2017 · US
Diagnostic circuit of a voltage suppression circuit in a drive circuit of a fluid injector and method for diagnosing a fault in the voltage suppression circuit
US-9618557-B2 · Apr 11, 2017 · US
Dither current power supply control method and dither current power supply control apparatus
US-2017062110-A1 · Mar 2, 2017 · US
Method and device for monitoring an actuator device
US-9523323-B2 · Dec 20, 2016 · US
Lifting armature actuator
US-9524818-B2 · Dec 20, 2016 · US
Determining the closing point in time of an injection valve on the basis of an analysis of the actuation voltage using an adapted reference voltage signal
US-9494100-B2 · Nov 15, 2016 · US
Method for embedded feedback control for bi-stable actuators
US-9488254-B2 · Nov 8, 2016 · US
Solenoid status determination methods and systems
US-9476943-B2 · Oct 25, 2016 · US
Valve Device
US-2016305568-A1 · Oct 20, 2016 · US
Semiconductor device, in-vehicle valve system and solenoid driver
US-2016300653-A1 · Oct 13, 2016 · US
Electromagnetic actuator
US-2016293364-A1 · Oct 6, 2016 · US
Method and system for diagnose of a solenoid valve
US-2016291075-A1 · Oct 6, 2016 · US
Method for Determining a Switching Function for a Sliding Mode Controller, and Sliding Mode Controller
US-2016266600-A1 · Sep 15, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F7/1844?
- CPC H01F7/1844 is the Cooperative Patent Classification code for “Monitoring or fail-safe circuits (for relays H01H47/002).”
- How many patents are filed under CPC H01F7/1844 (Monitoring or fail-safe circuits (for relays H01H47/002))?
- Our database includes 407 publications tagged with this CPC code.
- Is patent activity under CPC H01F7/1844 growing?
- Publication counts under this code: 41 in 2024 vs 21 in 2025 (latest complete years).