B61L 1/185
Use of direct current
Official title: {Use of direct current}
B61L1/185 (Use of direct current) appears on 21 US grants and 22 published applications in this corpus.
Search patents in B61L- Granted patents
- 21
- Published applications
- 22
- Assignees
- 16
- Inventors
- 38
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 1 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 2 | 1 |
| 2021 | 1 | 3 |
| 2022 | 1 | 4 |
| 2023 | 3 | 1 |
| 2024 | 4 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 0 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle2 Jun 2026US 12,643,583 B2
- Method and system for estimating temperature-related forces in railway lines11 Nov 2025US 12,466,451 B2KB Signaling Inc.
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system31 Dec 2024US 12,179,815 B2ALSTOM Holdings
- System for communicating vehicle information2 Apr 2024US 11,945,482 B2Westinghouse Air Brake Technologies Corporation
- Method, system, computer-readable medium comprising software code for estimating parameters of railway track circuits, and related track circuit27 Feb 2024US 11,912,322 B2Alstom Transport Technologies
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system20 Mar 2025US 2025/0091625 A1ALSTOM Holdings
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system13 Feb 2025US 2025/0050922 A1Alstom Transport Technologies
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle9 May 2024US 2024/0149931 A1ALSTOM Holdings
- Method and system for estimating temperature-related forces in railway lines30 Mar 2023US 2023/0094944 A1Alstom Transport Technologies
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system15 Dec 2022US 2022/0396298 A1Alstom Transport Technologies
Most cited
By later US patents
- Electronic vital relay14US 7,296,770 B2Union Switch & Signal Inc. · 2007
- System and method for broken rail and train detection10US 7,823,841 B2General Electric Company · 2010
- Track circuit providing enhanced broken rail detection3US 9,150,228 B22015
- Method and controller for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track2US 11,577,763 B2Alstom Transport Technologies · 2023
- Method, controller and track circuit for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track2US 11,780,482 B2Alstom Transport Technologies · 2023