B61F 1/00
Underframes
Official title: Underframes (making railway vehicle underframes by forging or pressing B21K7/12)
B61F1/00 (Underframes) appears on 316 US grants and 245 published applications in this corpus.
Search patents in B61F- Granted patents
- 316
- Published applications
- 245
- Assignees
- 126
- Inventors
- 703
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 7 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 10 | 0 |
| 1987 | 5 | 0 |
| 1988 | 10 | 0 |
| 1989 | 9 | 0 |
| 1990 | 8 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 8 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 8 | 1 |
| 2002 | 5 | 7 |
| 2003 | 5 | 5 |
| 2004 | 6 | 5 |
| 2005 | 6 | 4 |
| 2006 | 3 | 3 |
| 2007 | 0 | 4 |
| 2008 | 5 | 4 |
| 2009 | 6 | 3 |
| 2010 | 2 | 5 |
| 2011 | 4 | 3 |
| 2012 | 2 | 4 |
| 2013 | 2 | 10 |
| 2014 | 7 | 6 |
| 2015 | 11 | 19 |
| 2016 | 10 | 12 |
| 2017 | 6 | 12 |
| 2018 | 14 | 22 |
| 2019 | 8 | 24 |
| 2020 | 19 | 17 |
| 2021 | 23 | 22 |
| 2022 | 14 | 19 |
| 2023 | 11 | 8 |
| 2024 | 14 | 13 |
| 2025 | 10 | 6 |
| 2026 | 11 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Locked-axle spring compression system and method15 Sep 2026US 12,735,080 B2BNSF Railway Company
- 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.
- Launching device of roller coasters11 Aug 2026US 12,702,933 B2Guangdong Jinma Entertainment Corp., Ltd
- Railcar bodyshell4 Aug 2026US 12,698,014 B2Kawasaki Railcar Manufacturing Co., Ltd.
- Underframe for a rail vehicle car body28 Jul 2026US 12,691,914 B2Siemens Mobility Austria GmbH
- Undercarriage for a rail-bound maglev vehicle of a magnetic levitation train, and maglev vehicle13 Aug 2026US 2026/0233766 A1Max Boegl Stiftung & Co. KG
- Narrow vehicle body high-speed maglev train and suspension frame therefor6 Aug 2026US 2026/0225626 A1Crrc Qingdao Sifang Co., Ltd.
- Lightweight underframe for machine11 Jun 2026US 2026/0159139 A1Progress Rail Locomotive Inc.
- Rail Vehicle and Running Gear for the Rail Vehicle28 May 2026US 2026/0145713 A1Siemens Mobility Austria GmbH
- Railroad car having multiple penetration resistant and protective structures14 May 2026US 2026/0131831 A1Hgmotive, Inc.
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
- Insulated composite railway boxcar and method75US 5,765,485 ATrinity Industries, Inc. · 1998
- Low level freight car72US 4,686,907 AHawker Siddeley Canada Ltd. · 1987