Control device, refrigeration system, control method, and control program
US-2026029182-A1 · Jan 29, 2026 · US
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Noise
Noise · 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 | F04B2201/0804 |
| Official title | Noise |
| Display label | Noise |
| Total patents | 16 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 1 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Inlet silencer for a volumetric compressor and volumetric compressor equipped with it
US-2025369431-A1 · Dec 4, 2025 · US
Air conditioning compressor sound attenuation
US-12007127-B2 · Jun 11, 2024 · US
Compressor comprising an upper shell and a lower shell wherein the upper shell comprises an upper protrusion comprising a first protrusion and a second protrusion comprising a transition and an approximately flat shape
US-11231024-B2 · Jan 25, 2022 · US
Air Conditioning Compressor Sound Attenuation
US-2021388996-A1 · Dec 16, 2021 · US
Air conditioning compressor sound attenuation
US-11105520-B2 · Aug 31, 2021 · US
Linear compressor
US-10890168-B2 · Jan 12, 2021 · US
Variable displacement swash plate type compressor
US-10815980-B2 · Oct 27, 2020 · US
Air Conditioning Compressor Sound Attenuation
US-2020191415-A1 · Jun 18, 2020 · US
Liquid slugging detection and protection
US-10627146-B2 · Apr 21, 2020 · US
Compressor and sound insulating member for compressor
US-2019139528-A1 · May 9, 2019 · US
Variable displacement swash plate type compressor
US-2019032648-A1 · Jan 31, 2019 · US
Compressor
US-2018230985-A1 · Aug 16, 2018 · US
Linear compressor
US-2018135612-A1 · May 17, 2018 · US
Liquid Slugging Detection And Protection
US-2018106520-A1 · Apr 19, 2018 · US
Method for controlling knocking in a piston compressor
US-2016305420-A1 · Oct 20, 2016 · US