B61D 7/02
Hopper cars: with discharge openings in the bottoms
Official title: with discharge openings in the bottoms (with body in two halves and discharge by tipping the halves B61D9/00)
B61D7/02 (Hopper cars: with discharge openings in the bottoms) appears on 172 US grants and 162 published applications in this corpus.
Search patents in B61D- Granted patents
- 172
- Published applications
- 162
- Assignees
- 64
- Inventors
- 286
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 5 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 3 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 4 |
| 2009 | 0 | 2 |
| 2010 | 4 | 7 |
| 2011 | 6 | 5 |
| 2012 | 5 | 6 |
| 2013 | 6 | 3 |
| 2014 | 2 | 9 |
| 2015 | 5 | 7 |
| 2016 | 8 | 9 |
| 2017 | 4 | 6 |
| 2018 | 7 | 17 |
| 2019 | 12 | 10 |
| 2020 | 12 | 14 |
| 2021 | 6 | 8 |
| 2022 | 2 | 8 |
| 2023 | 14 | 8 |
| 2024 | 6 | 4 |
| 2025 | 12 | 13 |
| 2026 | 4 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Railroad hopper car with flow through structure25 Aug 2026US 12,715,484 B2National Steel Car Limited
- Covered hopper railcar10 Mar 2026US 12,570,333 B2Jac Operations, Inc.
- System and apparatus for providing supplemental securement of doors of bottom dump material transport containers3 Feb 2026US 12,539,891 B1
- Railcar gate adaptor and railcar modification using the same20 Jan 2026US 12,528,521 B2Jac Operations, Inc.
- Hopper car discharge gate seal assembly18 Nov 2025US 12,472,994 B2Trinity Rail Group, LLC
- Devices and systems for articulating an outlet gate door24 Sep 2026US 2026/0285377 A1Transportation IP Holdings, LLC
- Gondola railroad car with clean-out assembly30 Jul 2026US 2026/0217282 A1Gunderson LLC
- Cold Formed Chord Segmented Panel Contoured Sidewall Hopper Car30 Jul 2026US 2026/0217284 A1
- Covered hopper railcar16 Jul 2026US 2026/0200506 A1
- Aerodynamic railcar panel21 May 2026US 2026/0138650 A1Composite Sign Products Inc.
Most cited
By later US patents
- 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
- Railcar with discharge control system77US 7,891,304 B2Trinity Industries, Inc. · 2011
- Filament composite railroad car36US 4,292,898 ACargill, Incorporated · 1981
- Depressed center car33US 4,236,459 AThe Youngstown Steel Door Company · 1980