State estimation device, drive system, refrigeration system, fan system, state estimation method, and state estimation program
US-2026022878-A1 · Jan 22, 2026 · US
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Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values
Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values · 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 | F25B2500/15 |
| Official title | Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values |
| Display label | Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values |
| Total patents | 23 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 2 |
| 2020 | 2 |
| 2021 | 4 |
| 2023 | 5 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Bulbless thermostatic expansion valve and method of joining insulated power element
US-12270582-B1 · Apr 8, 2025 · US
Heat pump and method for operating heat pump
US-12117857-B2 · Oct 15, 2024 · US
Bulbless thermal expansion valve
US-11808498-B2 · Nov 7, 2023 · US
Method for controlling refrigerator to alternately cool two storage compartments
US-11732948-B2 · Aug 22, 2023 · US
Bulbless thermal expansion valve
US-2023251006-A1 · Aug 10, 2023 · US
Air conditioner
US-2023221030-A1 · Jul 13, 2023 · US
Thermal expansion valve for a residential refrigeration application
US-2023034594-A1 · Feb 2, 2023 · US
Thermal sensing bulb containing a ballast material for an expansion valve
US-2021381732-A1 · Dec 9, 2021 · US
Heat pump and method for operating heat pump
US-2021318700-A1 · Oct 14, 2021 · US
Heat pump system and start up control method thereof
US-11137170-B2 · Oct 5, 2021 · US
Method for controlling refrigerator
US-2021302092-A1 · Sep 30, 2021 · US
Air conditioning system and control method thereof
US-2020318881-A1 · Oct 8, 2020 · US
Refrigerating system and refrigerating system control method
US-2020018523-A1 · Jan 16, 2020 · US
Heat pump system and start up control method thereof
US-2019285317-A1 · Sep 19, 2019 · US
Harmonic current compensator and air-conditioning system
US-10250037-B2 · Apr 2, 2019 · US
Throttle device, and refrigeration cycle system including same
US-10088207-B2 · Oct 2, 2018 · US
Expansion valve
US-2018202696-A1 · Jul 19, 2018 · US
Expansion valve for a refrigeration cycle
US-9726407-B2 · Aug 8, 2017 · US
Throttle device, and refrigeration cycle system including same
US-2017030616-A1 · Feb 2, 2017 · US