B61D 7/16
Closure elements for discharge openings
B61D7/16 (Closure elements for discharge openings) appears on 346 US grants and 183 published applications in this corpus.
Search patents in B61D- Granted patents
- 346
- Published applications
- 183
- Assignees
- 115
- Inventors
- 382
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 8 | 0 |
| 1978 | 8 | 0 |
| 1979 | 6 | 0 |
| 1980 | 18 | 0 |
| 1981 | 16 | 0 |
| 1982 | 12 | 0 |
| 1983 | 2 | 0 |
| 1984 | 8 | 0 |
| 1985 | 6 | 0 |
| 1986 | 8 | 0 |
| 1987 | 5 | 0 |
| 1988 | 8 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 4 | 0 |
| 1993 | 9 | 0 |
| 1994 | 8 | 0 |
| 1995 | 9 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 0 | 0 |
| 2000 | 9 | 0 |
| 2001 | 6 | 2 |
| 2002 | 6 | 3 |
| 2003 | 3 | 2 |
| 2004 | 1 | 4 |
| 2005 | 4 | 8 |
| 2006 | 7 | 12 |
| 2007 | 4 | 10 |
| 2008 | 6 | 3 |
| 2009 | 4 | 4 |
| 2010 | 10 | 12 |
| 2011 | 8 | 10 |
| 2012 | 9 | 6 |
| 2013 | 8 | 8 |
| 2014 | 7 | 10 |
| 2015 | 9 | 9 |
| 2016 | 7 | 7 |
| 2017 | 7 | 5 |
| 2018 | 7 | 15 |
| 2019 | 10 | 9 |
| 2020 | 11 | 13 |
| 2021 | 5 | 6 |
| 2022 | 2 | 7 |
| 2023 | 8 | 7 |
| 2024 | 6 | 3 |
| 2025 | 7 | 4 |
| 2026 | 3 | 4 |
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
- Opening stop device for railway freight car door outlet gates24 Mar 2026US 12,583,488 B2A. Stucki Company
- System and apparatus for providing supplemental securement of doors of bottom dump material transport containers3 Feb 2026US 12,539,891 B1
- Hopper car discharge gate seal assembly18 Nov 2025US 12,472,994 B2Trinity Rail Group, LLC
- Hopper car outlet gate mechanical flap to prevent pellet loss4 Nov 2025US 12,459,547 B2Chevron Phillips Chemical Company LP
- Devices and systems for articulating an outlet gate door24 Sep 2026US 2026/0285377 A1Transportation IP Holdings, LLC
- Hopper Car Discharge Gate Seal Assembly5 Mar 2026US 2026/0062036 A1Trinity Rail Group, LLC
- Cast components for cold formed center sill rail car modification programs26 Feb 2026US 2026/0054753 A1
- Hopper car outlet gate mechanical flap to prevent pellet loss15 Jan 2026US 2026/0015017 A1Chevron Phillips Chemical Company LP
- Improved Automatic Hatch System for Trough Loaded Hopper Railcars9 Oct 2025US 2025/0313240 A1
Most cited
By later US patents
- Powered hopper door107US 4,359,176 A1982
- Railway hopper car gate valve and operating assembly97US 5,613,446 ATrinity Industries, Inc. · 1997
- Manual railroad hopper car door actuating mechanism97US 6,955,127 B22005
- Railcar unloading system93US 8,379,927 B2Concept Systems Limited · 2013
- Railcar with discharge control system90US 7,051,661 B2TRN Business Trust · 2006