Hydrostatic valve arrangement, hydrostatic gear having the valve arrangement, and hydrostatic drive having the gear
US-10808838-B2 · Oct 20, 2020 · US
Filling or draining of fluid systems
Filling or draining of fluid systems · 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 | F15B21/005 |
| Official title | {Filling or draining of fluid systems} |
| Display label | Filling or draining of fluid systems |
| Total patents | 126 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 3 |
| 2017 | 15 |
| 2018 | 10 |
| 2019 | 17 |
| 2020 | 15 |
| 2021 | 13 |
| 2022 | 10 |
| 2023 | 7 |
| 2024 | 14 |
| 2025 | 15 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydraulic systems and methods for powering auxiliary circuits
US-10774850-B2 · Sep 15, 2020 · US
Steam valve driving apparatus
US-2020256479-A1 · Aug 13, 2020 · US
Compressed-air supply system, pneumatic system and method for operating a compressed-air supply system
US-10717336-B2 · Jul 21, 2020 · US
Safety system for a pressure accumulator
US-2020149683-A1 · May 14, 2020 · US
Control system for flushing contaminated hydraulic fluid
US-10626896-B2 · Apr 21, 2020 · US
Hydraulic leveling device of washing machine and filling method thereof
US-10626541-B2 · Apr 21, 2020 · US
Working machine
US-10626895-B2 · Apr 21, 2020 · US
Valve System For Flushing Contaminated Hydraulic Fluid
US-2020049173-A1 · Feb 13, 2020 · US
Control System For Flushing Contaminated Hydraulic Fluid
US-2020049172-A1 · Feb 13, 2020 · US
Pressure limiting device, in particular for an assist system for vehicles
US-10519987-B2 · Dec 31, 2019 · US
Hydraulic systems and methods for powering auxiliary circuits
US-2019323525-A1 · Oct 24, 2019 · US
Hydraulic control unit for a limited slip differential
US-2019301583-A1 · Oct 3, 2019 · US
Control valve device
US-10415717-B2 · Sep 17, 2019 · US
Two-piece stand-pipe
US-10364937-B2 · Jul 30, 2019 · US
Valve device and fluid pressure control device
US-10359057-B2 · Jul 23, 2019 · US
Pneumatic circuit for passenger car pneumatic suspension system
US-10343479-B2 · Jul 9, 2019 · US
Self-Cleaning Mechanism for Pneumatic Central Clutch Release
US-2019203745-A1 · Jul 4, 2019 · US
Method And Apparatus For Cleaning And/Or Replacing Hydraulic Oil In Hydraulic Drives
US-2019195250-A1 · Jun 27, 2019 · US
Hydraulic control unit for a limited slip differential
US-10330187-B2 · Jun 25, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F15B21/005?
- CPC F15B21/005 is the Cooperative Patent Classification code for “Filling or draining of fluid systems.”
- How many patents are filed under CPC F15B21/005 (Filling or draining of fluid systems)?
- Our database includes 126 publications tagged with this CPC code.
- Is patent activity under CPC F15B21/005 growing?
- Publication counts under this code: 14 in 2024 vs 15 in 2025 (latest complete years).