Hopper Car Discharge Gate Seal Assembly
US-2026062036-A1 · Mar 5, 2026 · US
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sliding
sliding · 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 | B61D7/20 |
| Official title | sliding |
| Display label | sliding |
| Total patents | 15 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 1 |
| 2023 | 5 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hopper car discharge gate seal assembly
US-12472994-B2 · Nov 18, 2025 · US
Discharge gate arrangements for railroad hopper cars
US-12024211-B2 · Jul 2, 2024 · US
Railroad hopper car with flow through structure
US-2023399033-A1 · Dec 14, 2023 · US
Discharge gate arrangements for railroad hopper cars
US-2023311955-A1 · Oct 5, 2023 · US
Discharge gate arrangements for railroad hopper cars
US-11708095-B2 · Jul 25, 2023 · US
Railroad hopper car structure and gate therefor
US-11697437-B2 · Jul 11, 2023 · US
Railroad hopper car with flow through structure
US-11691652-B2 · Jul 4, 2023 · US
Hopper car discharge gate seal assembly
US-2022371629-A1 · Nov 24, 2022 · US
Hopper car discharge gates
US-11014583-B2 · May 25, 2021 · US
Discharge gate arrangements for railroad hopper cars
US-2021146967-A1 · May 20, 2021 · US
Discharge gate arrangements for railroad hopper cars
US-10906561-B2 · Feb 2, 2021 · US
Railroad hopper car with flow through structure
US-2020353954-A1 · Nov 12, 2020 · US
Railroad hopper car structure and gate therefor
US-2020339163-A1 · Oct 29, 2020 · US
Discharge gate arrangements for railroad hopper cars
US-2020062280-A1 · Feb 27, 2020 · US