Compressor
US-2024200556-A1 · Jun 20, 2024 · US
Mechanical Engineering
Mechanical Engineering · 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 | F04C2/344 |
| Official title | — |
| Display label | Mechanical Engineering (mapped technology topic) |
| Total patents | 424 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 25 |
| 2016 | 45 |
| 2017 | 57 |
| 2018 | 50 |
| 2019 | 38 |
| 2020 | 36 |
| 2021 | 41 |
| 2022 | 42 |
| 2023 | 37 |
| 2024 | 23 |
| 2025 | 24 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Water-hydraulic machine
US-2016377066-A1 · Dec 29, 2016 · US
Oil pump device
US-2016348673-A1 · Dec 1, 2016 · US
Variable vane displacement pump utilizing a control valve and a switching valve
US-9494152-B2 · Nov 15, 2016 · US
Fluid working systems
US-2016327038-A1 · Nov 10, 2016 · US
Variable capacity vane pump with a rotor and a cam ring rotatable eccentrically relative to a center of the rotor
US-9482228-B2 · Nov 1, 2016 · US
Filling machine and method for filling a pasty mass
US-2016302432-A1 · Oct 20, 2016 · US
Filling machine and method for monitoring the state of fouling in a vacuum system of a filling machine
US-2016302431-A1 · Oct 20, 2016 · US
Rotary cabonator
US-9440836-B2 · Sep 13, 2016 · US
Variable displacement pump
US-2016252080-A1 · Sep 1, 2016 · US
Distributer phase shifter for a hydraulic pump motor
US-2016245084-A1 · Aug 25, 2016 · US
Gear pump including friction brake ring to generate uniform conveyance flow
US-9416781-B2 · Aug 16, 2016 · US
Vane cell machine
US-2016230757-A1 · Aug 11, 2016 · US
Variable displacement oil pump
US-9410514-B2 · Aug 9, 2016 · US
Low-pulse vane pumps
US-2016208799-A1 · Jul 21, 2016 · US
Variable displacement pump
US-2016186751-A1 · Jun 30, 2016 · US
Variable displacement oil pump
US-2016177950-A1 · Jun 23, 2016 · US
Rotary pump with a compact setting structure for adjusting the delivery volume
US-2016177948-A1 · Jun 23, 2016 · US
Vane pump
US-2016177947-A1 · Jun 23, 2016 · US
Vane pump with a vane ring, a vane ring housing chamber and vane ring opposite pressure chambers
US-9366251-B2 · Jun 14, 2016 · US
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C2/344?
- CPC F04C2/344 is the Cooperative Patent Classification code for “Mechanical Engineering.”
- How many patents are filed under CPC F04C2/344 (Mechanical Engineering)?
- Our database includes 424 publications tagged with this CPC code.
- Is patent activity under CPC F04C2/344 growing?
- Publication counts under this code: 23 in 2024 vs 24 in 2025 (latest complete years).