B61F
Rail vehicle suspensions
Official title: Rail vehicle suspensions, e.g. underframes, bogies or arrangements of wheel axles; rail vehicles for use on tracks of different width; preventing derailing of rail vehicles; wheel guards, obstruction removers or the like for rail vehicles (for vehicles in general b60; axles or wheels b60b; vehicle tyres b60c)
B61F (Rail vehicle suspensions) appears on 2,277 US grants and 1,506 published applications in this corpus.
Search patents in B61F- Granted patents
- 2,277
- Published applications
- 1,506
- Assignees
- 724
- Inventors
- 3,370
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 40 | 0 |
| 1977 | 35 | 0 |
| 1978 | 46 | 0 |
| 1979 | 31 | 0 |
| 1980 | 48 | 0 |
| 1981 | 41 | 0 |
| 1982 | 53 | 0 |
| 1983 | 27 | 0 |
| 1984 | 52 | 0 |
| 1985 | 31 | 0 |
| 1986 | 32 | 0 |
| 1987 | 42 | 0 |
| 1988 | 50 | 0 |
| 1989 | 48 | 0 |
| 1990 | 34 | 0 |
| 1991 | 35 | 0 |
| 1992 | 33 | 0 |
| 1993 | 30 | 0 |
| 1994 | 29 | 0 |
| 1995 | 39 | 0 |
| 1996 | 44 | 0 |
| 1997 | 28 | 0 |
| 1998 | 40 | 0 |
| 1999 | 33 | 0 |
| 2000 | 37 | 0 |
| 2001 | 45 | 10 |
| 2002 | 48 | 33 |
| 2003 | 38 | 32 |
| 2004 | 29 | 40 |
| 2005 | 26 | 34 |
| 2006 | 24 | 29 |
| 2007 | 15 | 33 |
| 2008 | 23 | 27 |
| 2009 | 26 | 40 |
| 2010 | 19 | 59 |
| 2011 | 27 | 43 |
| 2012 | 40 | 64 |
| 2013 | 53 | 58 |
| 2014 | 66 | 75 |
| 2015 | 52 | 83 |
| 2016 | 82 | 97 |
| 2017 | 63 | 84 |
| 2018 | 76 | 105 |
| 2019 | 83 | 127 |
| 2020 | 94 | 93 |
| 2021 | 95 | 100 |
| 2022 | 79 | 72 |
| 2023 | 70 | 54 |
| 2024 | 59 | 55 |
| 2025 | 46 | 37 |
| 2026 | 41 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- B61F 5/00Constructional details of bogies1,546
- B61F 3/00Types of bogies459
- B61F 1/00Underframes316
- B61F 15/00Axle-boxes164
- B61F 9/00Rail vehicles characterised by means for preventing derailing140
- B61F 19/00Wheel guards85
- B61F 13/00Rail vehicles characterised by wheel arrangements, not otherwise provided for42
- B61F 7/00Rail vehicles equipped for use on tracks of different width28
Recent patents
- Wheel assemblies for shuttles powered by linear synchronous motors6 Oct 2026US 12,752,632 B1Amazon Technologies, Inc.
- Locked-axle spring compression system and method15 Sep 2026US 12,735,080 B2BNSF Railway Company
- Bogie for a light rail system25 Aug 2026US 12,715,309 B2The Council of the City of Coventry Council House
- 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.
- Bogie frame for a railway vehicle25 Aug 2026US 12,715,485 B2Hitachi, Ltd.
- 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.
- Multifunctional steering control system for radial bogies30 Jul 2026US 2026/0217285 A1Changchun Sujian New Technology Development Co., Ltd.
- An automated storage and retrieval system with logically operable barriers for safe enter and exit into a transport vehicle, and an associated method23 Jul 2026US 2026/0208769 A1Autostore Technology AS
- An automated storage and retrieval system comprising lockable barriers for safe transfer of persons into a transport vehicle on a live grid, and associated method23 Jul 2026US 2026/0208770 A1Autostore Technology AS
Most cited
By later US patents
- System and method for the detection of vehicle rollover conditions256US 5,825,284 ARollover Operations, LLC · 1998
- Bogie vehicle with electrohydraulic brakes and hydropneumatic suspension103US 5,074,624 ACompagnie Industrielle de Materiel de Transport · 1991
- Articulated flat car102US 4,947,760 ATrailer Train Company · 1990
- Service-life, low-profile, retrofittable, elastomeric mounting for three-piece, railroad-car trucks101US 5,237,933 ALord Corporation · 1993
- Railway container and car100US 4,478,155 AThe Atchison, Topeka and Santa Fe Railway Company · 1984