B61D 7/08
Hopper cars: with openings capable of discharging only outside the wheels
Official title: with openings capable of discharging only outside the wheels
B61D7/08 (Hopper cars: with openings capable of discharging only outside the wheels) appears on 10 US grants and 6 published applications in this corpus.
Search patents in B61D- Granted patents
- 10
- Published applications
- 6
- Assignees
- 7
- Inventors
- 11
- Latest grant
- 28 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Mechanism for longitudinal door systems28 Jan 2025US 12,208,826 B2Trinity Rail Group, LLC
- Belly dump trailer with conveyors for moving material9 Jan 2024US 11,866,074 B2
- Mechanism for longitudinal door systems18 Jul 2023US 11,702,113 B2Trinity Rail Group, LLC
- Mechanism for longitudinal door systems15 Sep 2020US 10,773,734 B2Trinity Rail Group, LLC
- Hopper car with lading dislodgement fittings and method of operation12 Apr 2011US 7,921,783 B2National Steel Car Limited
- Dump car having arced top and side gates29 May 2025US 2025/0171055 A1Nordic Minesteel Technologies Inc.
- Mechanism For Longitudinal Door Systems7 Mar 2024US 2024/0075966 A1Trinity Rail Group, LLC
- Belly dump trailer with conveyors for moving material20 Oct 2022US 2022/0332353 A1
- Mechanism For Longitudinal Door Systems26 Nov 2020US 2020/0369300 A1Trinity Rail Group, LLC
- Mechanism For Longitudinal Door Systems4 Oct 2018US 2018/0281824 A1Trinity Rail Group, LLC
Most cited
By later US patents
- Hopper car with lading dislodgement fittings and method of operation86US 7,921,783 B2National Steel Car Limited · 2011
- Railway hopper car and center sill construction therefor17US 4,493,266 AGeneral American Transportation Corporation · 1985
- Partitioned railway hopper car15US 4,246,849 APullman Incorporated · 1981
- Railway car side discharge door locking arrangement10US 4,291,631 APullman Incorporated · 1981
- Pneumatic outlet valve9US 4,382,725 AACF Industries, Incorporated · 1983