Compressor
US-2021340984-A1 · Nov 4, 2021 · US
by changing the eccentricity between cooperating members
by changing the eccentricity between cooperating members · 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 | F04C28/22 |
| Official title | by changing the eccentricity between cooperating members |
| Display label | by changing the eccentricity between cooperating members |
| Total patents | 86 |
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 | 3 |
| 2017 | 1 |
| 2018 | 15 |
| 2019 | 14 |
| 2020 | 16 |
| 2021 | 16 |
| 2022 | 10 |
| 2023 | 4 |
| 2024 | 2 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Scroll compressor
US-11092154-B2 · Aug 17, 2021 · US
Rotary compressor
US-11002279-B2 · May 11, 2021 · US
Fluid transfer apparatus
US-2021123438-A1 · Apr 29, 2021 · US
Hermetic compressor
US-2021095669-A1 · Apr 1, 2021 · US
Scroll compressor
US-10954942-B2 · Mar 23, 2021 · US
Rotary compressor with specific suction geometry
US-10954945-B2 · Mar 23, 2021 · US
Two-stage rotary compressor
US-10883501-B2 · Jan 5, 2021 · US
Hermetic compressor having a vane with guide portion
US-10883502-B2 · Jan 5, 2021 · US
Compressor having improved discharge structure including discharge inlets, communication hole, and discharge outlet
US-10851789-B2 · Dec 1, 2020 · US
Compressor having centrifugation structure for supplying oil
US-10816000-B2 · Oct 27, 2020 · US
Rotary compressor with a valve in the vane
US-10794187-B2 · Oct 6, 2020 · US
Active clearance management in screw compressor
US-10738781-B2 · Aug 11, 2020 · US
Scroll compressor
US-10718329-B2 · Jul 21, 2020 · US
Scroll compressor
US-2020173437-A1 · Jun 4, 2020 · US
Scroll compressor including valve having multiple arms
US-10662945-B2 · May 26, 2020 · US
Fluid machinery, heat exchange equipment, and operating method for fluid machinery
US-10626858-B2 · Apr 21, 2020 · US
Compressor including rotor frame
US-2020095989-A1 · Mar 26, 2020 · US
Compressor
US-2020088180-A1 · Mar 19, 2020 · US
Scroll compressor and air conditioner having the same
US-10590931-B2 · Mar 17, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C28/22?
- CPC F04C28/22 is the Cooperative Patent Classification code for “by changing the eccentricity between cooperating members.”
- How many patents are filed under CPC F04C28/22 (by changing the eccentricity between cooperating members)?
- Our database includes 86 publications tagged with this CPC code.
- Is patent activity under CPC F04C28/22 growing?
- Publication counts under this code: 2 in 2024 vs 3 in 2025 (latest complete years).