B61D 7/28
Hydraulic or pneumatic
Official title: hydraulic or pneumatic
B61D7/28 (Hydraulic or pneumatic) appears on 91 US grants and 80 published applications in this corpus.
Search patents in B61D- Granted patents
- 91
- Published applications
- 80
- Assignees
- 44
- Inventors
- 148
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 4 |
| 2006 | 3 | 4 |
| 2007 | 0 | 3 |
| 2008 | 2 | 3 |
| 2009 | 1 | 0 |
| 2010 | 5 | 6 |
| 2011 | 5 | 5 |
| 2012 | 5 | 4 |
| 2013 | 3 | 4 |
| 2014 | 3 | 7 |
| 2015 | 6 | 4 |
| 2016 | 2 | 1 |
| 2017 | 1 | 2 |
| 2018 | 3 | 5 |
| 2019 | 4 | 5 |
| 2020 | 7 | 6 |
| 2021 | 1 | 4 |
| 2022 | 1 | 3 |
| 2023 | 5 | 1 |
| 2024 | 1 | 3 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and cast components for cold formed center sill rail car modification programs and railcars formed thereby4 Nov 2025US 12,459,549 B2Jac Operations, Inc.
- Mechanism for longitudinal door systems28 Jan 2025US 12,208,826 B2Trinity Rail Group, LLC
- Longitudinal door operating mechanism1 Oct 2024US 12,103,571 B2Railcar Innovations, LLC
- Rapid discharge door locking system5 Sep 2023US 11,745,771 B2Trinity Rail Group, LLC
- Mechanism for longitudinal door systems18 Jul 2023US 11,702,113 B2Trinity Rail Group, LLC
- Cast components for cold formed center sill rail car modification programs26 Feb 2026US 2026/0054753 A1
- Improved Automatic Hatch System for Trough Loaded Hopper Railcars9 Oct 2025US 2025/0313240 A1
- Method of repurposing small cube covered hopper railcars and modified railcars formed thereby2 May 2024US 2024/0140497 A1
- Modeling process and structural repair of a railway or metal car14 Mar 2024US 2024/0083468 A1Minetec S.A.
- Mechanism For Longitudinal Door Systems7 Mar 2024US 2024/0075966 A1Trinity Rail Group, LLC
Most cited
By later US patents
- Powered hopper door107US 4,359,176 A1982
- Railcar with discharge control system90US 7,051,661 B2TRN Business Trust · 2006
- Hopper car with lading dislodgement fittings and method of operation86US 7,921,783 B2National Steel Car Limited · 2011
- Sliding gate actuating mechanism77US 4,628,825 AAmerican Autogate Corporation · 1986
- Railcar with discharge control system77US 7,891,304 B2Trinity Industries, Inc. · 2011