Spring loaded hvac damper
US-2019234523-A1 · Aug 1, 2019 · US
spring-loaded
spring-loaded · 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 | F16K15/033 |
| Official title | {spring-loaded} |
| Display label | spring-loaded |
| Total patents | 175 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 17 |
| 2017 | 21 |
| 2018 | 12 |
| 2019 | 17 |
| 2020 | 21 |
| 2021 | 17 |
| 2022 | 16 |
| 2023 | 24 |
| 2024 | 12 |
| 2025 | 10 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Spring loaded HVAC damper
US-10302207-B2 · May 28, 2019 · US
Fuel tank check valve
US-10253894-B2 · Apr 9, 2019 · US
Clapper valve
US-10197172-B2 · Feb 5, 2019 · US
Method for locating check valve pin
US-2018355985-A1 · Dec 13, 2018 · US
Flapper-mounted buffer to cushion check valve closure
US-2018356001-A1 · Dec 13, 2018 · US
Dual action check valve with combined return and bypass passages
US-10144518-B2 · Dec 4, 2018 · US
Low flow-restriction shut-off valve with excess flow closure functionality
US-10132418-B2 · Nov 20, 2018 · US
Valve device for exhaust flow passage
US-2018266575-A1 · Sep 20, 2018 · US
Passive exhaust valve with dual torsion spring
US-9982793-B2 · May 29, 2018 · US
Passive exhaust valve with external torsion spring
US-9982794-B2 · May 29, 2018 · US
Bleed valves for gas turbine engines
US-9964223-B2 · May 8, 2018 · US
Check valve with accelerated closure
US-9945487-B2 · Apr 17, 2018 · US
Passive Exhaust Valve With Dual Torsion Spring
US-2018038494-A1 · Feb 8, 2018 · US
Passive Exhaust Valve With External Torsion Spring
US-2018038495-A1 · Feb 8, 2018 · US
Check valve
US-2018023714-A1 · Jan 25, 2018 · US
Check valve
US-2017356555-A1 · Dec 14, 2017 · US
Valve for Controlling a Gas Stream, Liquid Separator, Venting System and Internal Combustion Engine Having Such a Valve
US-2017350285-A1 · Dec 7, 2017 · US
Check valve with accelerated closure
US-2017343122-A1 · Nov 30, 2017 · US
Flapper and seat with a hard and soft seal for a subsurface safety valve
US-2017335658-A1 · Nov 23, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16K15/033?
- CPC F16K15/033 is the Cooperative Patent Classification code for “spring-loaded.”
- How many patents are filed under CPC F16K15/033 (spring-loaded)?
- Our database includes 175 publications tagged with this CPC code.
- Is patent activity under CPC F16K15/033 growing?
- Publication counts under this code: 12 in 2024 vs 10 in 2025 (latest complete years).