B61D 7/30
Controlled by means external to cars
Official title: controlled by means external to cars
B61D7/30 (Controlled by means external to cars) appears on 74 US grants and 22 published applications in this corpus.
Search patents in B61D- Granted patents
- 74
- Published applications
- 22
- Assignees
- 27
- Inventors
- 78
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 6 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 2 |
| 2006 | 2 | 2 |
| 2007 | 3 | 2 |
| 2008 | 2 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 3 |
| 2011 | 3 | 1 |
| 2012 | 1 | 0 |
| 2013 | 2 | 1 |
| 2014 | 0 | 2 |
| 2015 | 1 | 0 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 2 |
| 2021 | 0 | 0 |
| 2022 | 0 | 3 |
| 2023 | 2 | 1 |
| 2024 | 1 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Railroad hopper car with flow through structure25 Aug 2026US 12,715,484 B2National Steel Car Limited
- Longitudinal door operating mechanism1 Oct 2024US 12,103,571 B2Railcar Innovations, LLC
- Railroad hopper car structure and gate therefor11 Jul 2023US 11,697,437 B2National Steel Car Limited
- Railroad hopper car with flow through structure4 Jul 2023US 11,691,652 B2National Steel Car Limited
- Rail car key adaptor tool7 Jan 2020US 10,525,989 B2
- Improved Automatic Hatch System for Trough Loaded Hopper Railcars9 Oct 2025US 2025/0313240 A1
- Railroad hopper car with flow through structure14 Dec 2023US 2023/0399033 A1National Steel Car Limited
- Longitudinal door operating mechanism17 Nov 2022US 2022/0363294 A1Railcar Innovations, LLC
- Direct Drive Automated Hatch System for Hopper Railcars12 May 2022US 2022/0144318 A1Ecofab Covers International Inc.
- Automated Hatch System for Hopper Railcars12 May 2022US 2022/0144319 A1
Most cited
By later US patents
- Railcar unloading system93US 8,379,927 B2Concept Systems Limited · 2013
- Spike-type railcar mover with optional gate opener76US 7,377,219 B2Calbrandt, Inc. · 2008
- Remote control positioning system for controlling hopper doors42US 5,359,942 ADifco, Inc. · 1994
- High volume covered hopper car with loading from below and automatic unloading29US 4,677,917 AACF Industries, Incorporated · 1987
- Railroad hopper car with ballast distributing blades and remote control system25US 5,657,700 AHerzog Contracting Corp. · 1997