Railroad car truck side frame
US-12448014-B2 · Oct 21, 2025 · US
incorporating metal springs
incorporating metal springs · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B61F5/301 |
| Official title | {incorporating metal springs} |
| Display label | incorporating metal springs |
| Total patents | 34 |
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 | 1 |
| 2016 | 3 |
| 2017 | 1 |
| 2019 | 6 |
| 2020 | 5 |
| 2021 | 3 |
| 2022 | 7 |
| 2023 | 5 |
| 2024 | 2 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Locked-axle spring compression system and method
US-2024101166-A1 · Mar 28, 2024 · US
Locked-axle spring compression system and method
US-2024101165-A1 · Mar 28, 2024 · US
Rail vehicle and bogie
US-11827251-B2 · Nov 28, 2023 · US
Locked-axle spring compression system and method
US-11772689-B1 · Oct 3, 2023 · US
Methods and systems for dynamic weight management
US-11713063-B2 · Aug 1, 2023 · US
Rail vehicle and bogie
US-2023132924-A1 · May 4, 2023 · US
Railroad car truck side frame
US-2023001963-A1 · Jan 5, 2023 · US
Chassis for rail vehicles
US-11529976-B2 · Dec 20, 2022 · US
Running gear for a rail vehicle and associated rail vehicle
US-11518420-B2 · Dec 6, 2022 · US
Railroad car truck side frame
US-11479276-B2 · Oct 25, 2022 · US
Methods and systems for dynamic weight management
US-2022324492-A1 · Oct 13, 2022 · US
Methods and systems for dynamic weight management
US-11459002-B2 · Oct 4, 2022 · US
Railcar bogie including protective film and protective film-equipped plate spring
US-11299184-B2 · Apr 12, 2022 · US
Railway vehicle bogie, associated vehicle and axle installation method
US-2022089200-A1 · Mar 24, 2022 · US
Vehicle suspension system
US-11091178-B2 · Aug 17, 2021 · US
Axle box suspension of railcar
US-11066085-B2 · Jul 20, 2021 · US
Methods and systems for dynamic weight management
US-2021078615-A1 · Mar 18, 2021 · US
Locomotive suspension system
US-2020094857-A1 · Mar 26, 2020 · US
Railcar bogie including protective film and protective film-equipped plate spring
US-2020079402-A1 · Mar 12, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B61F5/301?
- CPC B61F5/301 is the Cooperative Patent Classification code for “incorporating metal springs.”
- How many patents are filed under CPC B61F5/301 (incorporating metal springs)?
- Our database includes 34 publications tagged with this CPC code.
- Is patent activity under CPC B61F5/301 growing?
- Publication counts under this code: 2 in 2024 vs 1 in 2025 (latest complete years).