Hydraulic energy retention
US-2025250001-A1 · Aug 7, 2025 · US
using springs
using springs · 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 | F15B2201/21 |
| Official title | using springs |
| Display label | using springs |
| Total patents | 49 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 3 |
| 2017 | 4 |
| 2018 | 5 |
| 2019 | 7 |
| 2020 | 6 |
| 2021 | 3 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydraulic energy retention
US-12312070-B2 · May 27, 2025 · US
Eha accumulator refilling arrangement
US-2025121931-A1 · Apr 17, 2025 · US
Hydraulic energy retention
US-2024417067-A1 · Dec 19, 2024 · US
Liquid feeder
US-11946491-B2 · Apr 2, 2024 · US
Vibration damper having a pump assembly
US-11946527-B2 · Apr 2, 2024 · US
Spring dampening for accumulator system
US-2023287905-A1 · Sep 14, 2023 · US
Pressure compensation device designed for underwater applications
US-11674529-B2 · Jun 13, 2023 · US
Autonomous actuator and refilling thereof
US-2022196037-A1 · Jun 23, 2022 · US
Vibration damper having a pump assembly
US-2022154798-A1 · May 19, 2022 · US
Accumulator module for hydromechanical spring-loaded drive
US-11286959-B2 · Mar 29, 2022 · US
Liquid feeder
US-2022057123-A1 · Feb 24, 2022 · US
Hydraulic lifting device for a chassis of a mobile device, chassis and mobile device
US-2021395056-A1 · Dec 23, 2021 · US
Transmission hydraulic control system
US-2021190203-A1 · Jun 24, 2021 · US
Bootstrap hydraulic reservoir
US-10920795-B2 · Feb 16, 2021 · US
Actuator assist apparatus, actuator system and method
US-10851805-B2 · Dec 1, 2020 · US
Hydraulic block for a hydraulic assembly of a brake control system of a hydraulic vehicle brake system
US-10814848-B2 · Oct 27, 2020 · US
Bootstrap hydraulic reservoir
US-2020166055-A1 · May 28, 2020 · US
Pressure Compensation Device Designed for Underwater Applications
US-2020166056-A1 · May 28, 2020 · US
Accumulator piston, in particular for a pressure medium accumulator of a hydraulic unit of an electronically slip-controllable vehicle brake system
US-10641296-B2 · May 5, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F15B2201/21?
- CPC F15B2201/21 is the Cooperative Patent Classification code for “using springs.”
- How many patents are filed under CPC F15B2201/21 (using springs)?
- Our database includes 49 publications tagged with this CPC code.
- Is patent activity under CPC F15B2201/21 growing?
- Publication counts under this code: 3 in 2024 vs 3 in 2025 (latest complete years).