Hydraulic rotary machine
US-10808686-B2 · Oct 20, 2020 · US
having two or more sets of cylinders or pistons
having two or more sets of cylinders or pistons · 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 | F04B1/22 |
| Official title | having two or more sets of cylinders or pistons |
| Display label | having two or more sets of cylinders or pistons |
| Total patents | 112 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 11 |
| 2016 | 7 |
| 2017 | 15 |
| 2018 | 11 |
| 2019 | 10 |
| 2020 | 14 |
| 2021 | 11 |
| 2022 | 7 |
| 2023 | 8 |
| 2024 | 6 |
| 2025 | 9 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Failure diagnosing device, pump unit including same, and failure diagnosing method
US-2020158146-A1 · May 21, 2020 · US
Hydrostatic Piston Machine
US-2020132069-A1 · Apr 30, 2020 · US
Hydraulic system
US-2020072052-A1 · Mar 5, 2020 · US
Swash plate type liquid-pressure rotating device and method of manufacturing same
US-10533544-B2 · Jan 14, 2020 · US
Piston and liquid-pressure rotating device including same
US-10527028-B2 · Jan 7, 2020 · US
Pump arrangement
US-10495074-B2 · Dec 3, 2019 · US
Hydrostatic axial piston machine
US-10458387-B2 · Oct 29, 2019 · US
Hydraulic Actuator
US-2019277269-A1 · Sep 12, 2019 · US
Cylinder block and swash plate type liquid-pressure rotating apparatus including same
US-2019264564-A1 · Aug 29, 2019 · US
Hydraulic machine
US-10385887-B2 · Aug 20, 2019 · US
Hydraulic rotary machine and valve plate thereof
US-2019145388-A1 · May 16, 2019 · US
Variable displacement axial piston pump with fluid controlled swash plate
US-10247178-B2 · Apr 2, 2019 · US
Hydrostatic axial piston machine
US-10240587-B2 · Mar 26, 2019 · US
Hydraulic pump
US-10215226-B2 · Feb 26, 2019 · US
Hydraulic rotary machine
US-2019055931-A1 · Feb 21, 2019 · US
Dual output variable displacement axial piston pump and method thereof
US-2018347552-A1 · Dec 6, 2018 · US
Piston pump and valve plate of piston pump
US-10145367-B2 · Dec 4, 2018 · US
Variable displacement pump
US-2018328350-A1 · Nov 15, 2018 · US
Device for producing metal member
US-10071440-B2 · Sep 11, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04B1/22?
- CPC F04B1/22 is the Cooperative Patent Classification code for “having two or more sets of cylinders or pistons.”
- How many patents are filed under CPC F04B1/22 (having two or more sets of cylinders or pistons)?
- Our database includes 112 publications tagged with this CPC code.
- Is patent activity under CPC F04B1/22 growing?
- Publication counts under this code: 6 in 2024 vs 9 in 2025 (latest complete years).