Method and system for preventing freezing when four-way valve in heat pump water heater is failed, and heat pump water heater
US-2017261231-A1 · Sep 14, 2017 · US
of electric heaters
of electric heaters · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F24H15/37 |
| Official title | of electric heaters |
| Display label | of electric heaters |
| Total patents | 321 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 20 |
| 2016 | 37 |
| 2017 | 25 |
| 2018 | 20 |
| 2019 | 43 |
| 2020 | 35 |
| 2021 | 31 |
| 2022 | 28 |
| 2023 | 18 |
| 2024 | 37 |
| 2025 | 21 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System and approach for water heater comfort and efficiency improvement
US-2017167736-A1 · Jun 15, 2017 · US
Smart energy controlled water heater
US-9605872-B2 · Mar 28, 2017 · US
Pulse width modulated multiple heater control
US-9528723-B2 · Dec 27, 2016 · US
Apparatus and Methods for Pre-Heating Water with Air Conditioning Unit or Heat Pump
US-2016320093-A1 · Nov 3, 2016 · US
Water heater and method of operating a water heater
US-2016320095-A1 · Nov 3, 2016 · US
Vehicle air-conditioner safety device, and control method thereof
US-2016318375-A1 · Nov 3, 2016 · US
Thermostatic condensing gas water heater and control method therefor
US-2016313028-A1 · Oct 27, 2016 · US
Substrate liquid processing apparatus, and control method of heater unit
US-2016305688-A1 · Oct 20, 2016 · US
Pulsed power-based dry fire protection for electric water heaters
US-2016282013-A1 · Sep 29, 2016 · US
Heat Pump Water Heater and Control Method Thereof
US-2016265794-A1 · Sep 15, 2016 · US
Water heater and method of operating a water heater
US-9405304-B2 · Aug 2, 2016 · US
Integrated heater for a beverage preparation device
US-9398829-B2 · Jul 26, 2016 · US
Hot water supply system and method thereof
US-9400118-B2 · Jul 26, 2016 · US
Apparatus and methods for pre-heating water with air conditioning unit or heat pump
US-9389000-B2 · Jul 12, 2016 · US
Pulsed power-based dry fire protection for electric water heaters
US-9377342-B2 · Jun 28, 2016 · US
Heating device using photodetector to detect temperature and method for protecting the same
US-9377214-B2 · Jun 28, 2016 · US
Estimation of unknown states for an electric water heater with thermal stratification and use of same in demand response and condition-based maintenance
US-2016178221-A1 · Jun 23, 2016 · US
Automatic set point detection for water heaters operating in a demand response
US-2016178239-A1 · Jun 23, 2016 · US
Determining heating element and water heater status based on galvanic current
US-9372012-B2 · Jun 21, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F24H15/37?
- CPC F24H15/37 is the Cooperative Patent Classification code for “of electric heaters.”
- How many patents are filed under CPC F24H15/37 (of electric heaters)?
- Our database includes 321 publications tagged with this CPC code.
- Is patent activity under CPC F24H15/37 growing?
- Publication counts under this code: 37 in 2024 vs 21 in 2025 (latest complete years).