Hydraulic control system for coupler safety knuckle
US-2025243881-A1 · Jul 31, 2025 · US
using an enclosed pilot flow valve
using an enclosed pilot flow valve · 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 | F15B13/015 |
| Official title | {using an enclosed pilot flow valve} |
| Display label | using an enclosed pilot flow valve |
| Total patents | 44 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 2 |
| 2017 | 5 |
| 2018 | 2 |
| 2019 | 6 |
| 2020 | 7 |
| 2021 | 6 |
| 2023 | 4 |
| 2024 | 5 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydraulic valve and system
US-12310896-B2 · May 27, 2025 · US
Hydraulic valve assembly
US-12129873-B2 · Oct 29, 2024 · US
Valve assembly with preloaded control oil return
US-12044323-B2 · Jul 23, 2024 · US
Hydraulic valve and system
US-2024082079-A1 · Mar 14, 2024 · US
Hydraulic valve assembly
US-2024035491-A1 · Feb 1, 2024 · US
Hydraulic valve and system
US-11865051-B2 · Jan 9, 2024 · US
Valve Assembly with Preloaded Control Oil Return
US-2023175601-A1 · Jun 8, 2023 · US
Hydraulic valve and system
US-2023149231-A1 · May 18, 2023 · US
Method for detecting inadmissible operating conditions of work hydraulics of an agricultural tractor
US-11589493-B2 · Feb 28, 2023 · US
Hydraulic valve and system
US-11583455-B2 · Feb 21, 2023 · US
Proporational flow control valve and pilot-operated check valve integrated therewith
US-11009896-B2 · May 18, 2021 · US
Hydraulic valve and system
US-2021121338-A1 · Apr 29, 2021 · US
Proportional flow control and counterbalance valve having single seat configuration
US-10969801-B2 · Apr 6, 2021 · US
Method for detecting inadmissible operating conditions of work hydraulics of an agricultural tractor
US-2021076555-A1 · Mar 18, 2021 · US
Hydraulic system with a counterbalance valve configured as a meter-out valve and controlled by an independent pilot signal
US-10920799-B2 · Feb 16, 2021 · US
Proporational Flow Control Valve and Pilot-Operated Check Valve Integrated Therewith
US-2021004026-A1 · Jan 7, 2021 · US
Proportional Flow Control and Counterbalance Valve Having Single Seat Configuration
US-2020393856-A1 · Dec 17, 2020 · US
Transmission park valve with steel saddle
US-10808735-B2 · Oct 20, 2020 · US
Control valve
US-10753377-B2 · Aug 25, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F15B13/015?
- CPC F15B13/015 is the Cooperative Patent Classification code for “using an enclosed pilot flow valve.”
- How many patents are filed under CPC F15B13/015 (using an enclosed pilot flow valve)?
- Our database includes 44 publications tagged with this CPC code.
- Is patent activity under CPC F15B13/015 growing?
- Publication counts under this code: 5 in 2024 vs 2 in 2025 (latest complete years).