B61F 1/02
Underframes: with a single central sill
Official title: with a single central sill
B61F1/02 (Underframes: with a single central sill) appears on 78 US grants and 41 published applications in this corpus.
Search patents in B61F- Granted patents
- 78
- Published applications
- 41
- Assignees
- 29
- Inventors
- 108
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 5 |
| 2003 | 3 | 1 |
| 2004 | 2 | 2 |
| 2005 | 2 | 2 |
| 2006 | 3 | 2 |
| 2007 | 0 | 1 |
| 2008 | 2 | 1 |
| 2009 | 3 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 2 | 4 |
| 2016 | 3 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 3 |
| 2021 | 1 | 7 |
| 2022 | 2 | 2 |
| 2023 | 4 | 1 |
| 2024 | 3 | 3 |
| 2025 | 1 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rail car modularized modification programs altering the nature of the center sill in the modified railcar and the modified railcars formed thereby25 Aug 2026US 12,715,483 B2Jac Operations, Inc.
- Composite insulated boxcar floor19 May 2026US 12,630,200 B2Trinity Rail Group, LLC
- 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.
- Modular coil railcar31 Dec 2024US 12,179,811 B2Trinity Rail Group, LLC
- Open top gondola railcar6 Aug 2024US 12,054,183 B2Jac Operations, Inc.
- Cast components for cold formed center sill rail car modification programs26 Feb 2026US 2026/0054753 A1
- Modular Coil Railcar6 Mar 2025US 2025/0074480 A1Trinity Rail Group, LLC
- Open top gondola railcar28 Nov 2024US 2024/0391507 A1
- Sill Connection for Railcar Structure25 Jan 2024US 2024/0025460 A1Trinity Rail Group, LLC
- Composite insulated boxcar floor4 Jan 2024US 2024/0001970 A1TrinityRail Products and Services, LLC
Most cited
By later US patents
- Articulated flat car102US 4,947,760 ATrailer Train Company · 1990
- Railway freight car86US 4,917,019 ATrinity Industries, Inc. · 1990
- Rail semi-trailer and releasable coupler77US 4,741,273 A1988
- Articulated lightweight piggyback railcar65US 4,751,882 ACanadian National Railway Company · 1988
- Center brace member44US 4,128,062 ABuckeye International, Inc. · 1978