Economizer injection in a reciprocating compressor
US-2025347446-A1 · Nov 13, 2025 · US
having cylinders coaxial with, or parallel or inclined to, main shaft axis
having cylinders coaxial with, or parallel or inclined to, main shaft axis · 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 | F04B25/04 |
| Official title | having cylinders coaxial with, or parallel or inclined to, main shaft axis |
| Display label | having cylinders coaxial with, or parallel or inclined to, main shaft axis |
| Total patents | 46 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 2 |
| 2017 | 7 |
| 2018 | 6 |
| 2019 | 7 |
| 2020 | 6 |
| 2021 | 4 |
| 2022 | 2 |
| 2023 | 1 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Economizer injection in a reciprocating compressor
US-12398926-B2 · Aug 26, 2025 · US
Refrigerant compressor
US-2024410360-A1 · Dec 12, 2024 · US
Refrigerant compressor with stator elastic support
US-12146486-B2 · Nov 19, 2024 · US
Economizer injection in a reciprocating compressor
US-2023041180-A1 · Feb 9, 2023 · US
Multi-stage compressor and method of controlling the same
US-11353013-B2 · Jun 7, 2022 · US
Apparatus for reducing suction pulsation and swash plate type compressor comprising same
US-11293421-B2 · Apr 5, 2022 · US
Refrigerant compresssor
US-2021404457-A1 · Dec 30, 2021 · US
Swash plate type compressor
US-11187219-B2 · Nov 30, 2021 · US
Displacer assembly and cryocooler
US-11156214-B2 · Oct 26, 2021 · US
Multi-Stage Compressor and Method of Controlling the Same
US-2021054845-A1 · Feb 25, 2021 · US
Control valve for variable displacement compressor
US-10837431-B2 · Nov 17, 2020 · US
Moveable core-type reciprocating motor and reciprocating compressor having a moveable core-type reciprocating motor
US-10819173-B2 · Oct 27, 2020 · US
Moving core-type reciprocating motor and reciprocating compressor having the same
US-10811920-B2 · Oct 20, 2020 · US
Displacer assembly and cryocooler
US-2020263676-A1 · Aug 20, 2020 · US
Compressor with a closed loop water cooling system
US-10746177-B2 · Aug 18, 2020 · US
Compressor
US-10746162-B2 · Aug 18, 2020 · US
Discharge valve and compressor having the same
US-2019383278-A1 · Dec 19, 2019 · US
Swash plate type compressor
US-2019360476-A1 · Nov 28, 2019 · US
Spin pump with spun-epicyclic geometry having piston bores capped with caps including ducts or valves within the rotor
US-10465669-B2 · Nov 5, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04B25/04?
- CPC F04B25/04 is the Cooperative Patent Classification code for “having cylinders coaxial with, or parallel or inclined to, main shaft axis.”
- How many patents are filed under CPC F04B25/04 (having cylinders coaxial with, or parallel or inclined to, main shaft axis)?
- Our database includes 46 publications tagged with this CPC code.
- Is patent activity under CPC F04B25/04 growing?
- Publication counts under this code: 2 in 2024 vs 2 in 2025 (latest complete years).