Mechanism for longitudinal door systems
US-12208826-B2 · Jan 28, 2025 · US
hydraulic or pneumatic
hydraulic or pneumatic · 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 | B61D7/28 |
| Official title | hydraulic or pneumatic |
| Display label | hydraulic or pneumatic |
| Total patents | 26 |
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 | 2 |
| 2016 | 2 |
| 2018 | 3 |
| 2019 | 4 |
| 2020 | 8 |
| 2023 | 5 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Mechanism For Longitudinal Door Systems
US-2024075966-A1 · Mar 7, 2024 · US
Railroad hopper car with flow through structure
US-2023399033-A1 · Dec 14, 2023 · US
Rapid discharge door locking system
US-11745771-B2 · Sep 5, 2023 · US
Mechanism for longitudinal door systems
US-11702113-B2 · Jul 18, 2023 · US
Railroad hopper car with flow through structure
US-11691652-B2 · Jul 4, 2023 · US
Capstan-driven air pump system for opening and closing a longitudinal railcar door
US-11649744-B2 · May 16, 2023 · US
Rapid Discharge Door Locking System
US-2020398872-A1 · Dec 24, 2020 · US
Remotely operated railcar hatches
US-10858016-B2 · Dec 8, 2020 · US
Mechanism For Longitudinal Door Systems
US-2020369300-A1 · Nov 26, 2020 · US
Railroad hopper car with flow through structure
US-2020353954-A1 · Nov 12, 2020 · US
Rapid discharge door locking system
US-10773735-B2 · Sep 15, 2020 · US
Mechanism for longitudinal door systems
US-10773734-B2 · Sep 15, 2020 · US
Railroad hopper car body fittings
US-2020240193-A1 · Jul 30, 2020 · US
Railroad hopper car body fittings
US-10648217-B2 · May 12, 2020 · US
Remotely operated railcar hatches
US-2019126946-A1 · May 2, 2019 · US
Rail road hopper car
US-10214224-B2 · Feb 26, 2019 · US
Rapid discharge door locking system
US-2019016349-A1 · Jan 17, 2019 · US
Longitudinal gate hopper car without partitions
US-2019001997-A1 · Jan 3, 2019 · US
Railroad hopper car body fittings
US-2018305967-A1 · Oct 25, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B61D7/28?
- CPC B61D7/28 is the Cooperative Patent Classification code for “hydraulic or pneumatic.”
- How many patents are filed under CPC B61D7/28 (hydraulic or pneumatic)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC B61D7/28 growing?
- Publication counts under this code: 1 in 2024 vs 1 in 2025 (latest complete years).