Inverse proportional pressure relief valve
US-10775812-B1 · Sep 15, 2020 · US
with more than one spring
with more than one spring · 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 | F16K17/044 |
| Official title | {with more than one spring} |
| Display label | with more than one spring |
| Total patents | 110 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 10 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 20 |
| 2020 | 14 |
| 2021 | 10 |
| 2022 | 6 |
| 2023 | 5 |
| 2024 | 8 |
| 2025 | 7 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pressure limiting device, in particular for an assist system for vehicles
US-10519987-B2 · Dec 31, 2019 · US
Pressure Control Valve
US-2019368553-A1 · Dec 5, 2019 · US
Aspirator system pressure relief mechanism
US-2019360604-A1 · Nov 28, 2019 · US
Passive valve
US-10473225-B2 · Nov 12, 2019 · US
Proportional Normally-Open Valve with a Biasing Spring
US-2019331249-A1 · Oct 31, 2019 · US
Electrohydraulic counterbalance and pressure relief valve
US-10437269-B1 · Oct 8, 2019 · US
Passive valve
US-2019301627-A1 · Oct 3, 2019 · US
Fault-accommodating flow scheduling valve
US-2019285004-A1 · Sep 19, 2019 · US
Transmission pressure controlled vent system
US-2019271384-A1 · Sep 5, 2019 · US
Relief valve device
US-10400904-B2 · Sep 3, 2019 · US
Coupling device
US-10352492-B2 · Jul 16, 2019 · US
Pressure Regulating Valve for an Air Supply System of a Utility Vehicle
US-2019212757-A1 · Jul 11, 2019 · US
Decompression air valve
US-10323760-B2 · Jun 18, 2019 · US
Relief valve and substrate processing apparatus
US-2019136994-A1 · May 9, 2019 · US
Valve assembly for a tire pressure management system
US-2019126693-A1 · May 2, 2019 · US
Flow limiting duct vent valves and gas turbine engine bleed air systems including the same
US-10227929-B2 · Mar 12, 2019 · US
Dual Stage Pressure Relief Valve
US-2019072195-A1 · Mar 7, 2019 · US
Loop flushing valve
US-10197174-B1 · Feb 5, 2019 · US
Damped relief valve using double pistons
US-2019032811-A1 · Jan 31, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16K17/044?
- CPC F16K17/044 is the Cooperative Patent Classification code for “with more than one spring.”
- How many patents are filed under CPC F16K17/044 (with more than one spring)?
- Our database includes 110 publications tagged with this CPC code.
- Is patent activity under CPC F16K17/044 growing?
- Publication counts under this code: 8 in 2024 vs 7 in 2025 (latest complete years).