Method and device for controlling capacity change of compressor, and smart home appliance
US-11835040-B2 · Dec 5, 2023 · US
characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10)
characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10) · 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 | F04C28/18 |
| Official title | characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10) |
| Display label | characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10) |
| Total patents | 68 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 7 |
| 2017 | 7 |
| 2018 | 9 |
| 2019 | 11 |
| 2020 | 8 |
| 2021 | 10 |
| 2022 | 4 |
| 2023 | 4 |
| 2024 | 4 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Compressor having capacity modulation assembly
US-11635078-B2 · Apr 25, 2023 · US
Variable volume ratio screw compressor
US-2022299031-A1 · Sep 22, 2022 · US
Variable volume ratio screw compressor
US-11306721-B2 · Apr 19, 2022 · US
Air conditioner and compressor
US-2022049701-A1 · Feb 17, 2022 · US
Scroll compressor that includes a non-orbiting scroll member having a connection passage portion connected first valve assembly and second valve assembly
US-11215181-B2 · Jan 4, 2022 · US
Scroll compressor having a valve assembly controlling the opening/closing valve to open and close communication passage and bypass holes on fixed scroll
US-11204035-B2 · Dec 21, 2021 · US
Scroll compressor having cutout provided on movable wrap to reduce backflow
US-11131305-B2 · Sep 28, 2021 · US
Control flowrate regulating valve specifically for scroll compressor inside vehicle air conditioner or heat pump
US-11047383-B2 · Jun 29, 2021 · US
Method of improved control for variable volume ratio valve
US-2021180598-A1 · Jun 17, 2021 · US
Compressor Having Capacity Modulation Assembly
US-2021164470-A1 · Jun 3, 2021 · US
Co-rotating compressor
US-10995754-B2 · May 4, 2021 · US
Method and device for controlling capacity change of compressor, and smart home appliance
US-2021108845-A1 · Apr 15, 2021 · US
Variable volume ratio compressor
US-10962008-B2 · Mar 30, 2021 · US
Scroll compressor
US-10954942-B2 · Mar 23, 2021 · US
Compressor having capacity modulation assembly
US-10954940-B2 · Mar 23, 2021 · US
Method of improved control for variable volume ratio valve
US-10844860-B2 · Nov 24, 2020 · US
Control device for internal combustion engine
US-10788038-B2 · Sep 29, 2020 · US
Variable volume ratio screw compressor
US-2020208637-A1 · Jul 2, 2020 · US
Method of improved control for variable volume ratio valve
US-2020200175-A1 · Jun 25, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C28/18?
- CPC F04C28/18 is the Cooperative Patent Classification code for “characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10).”
- How many patents are filed under CPC F04C28/18 (characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10))?
- Our database includes 68 publications tagged with this CPC code.
- Is patent activity under CPC F04C28/18 growing?
- Publication counts under this code: 4 in 2024 vs 2 in 2025 (latest complete years).