B61L 1/188
Use of coded current
Official title: {Use of coded current}
B61L1/188 (Use of coded current) appears on 87 US grants and 56 published applications in this corpus.
Search patents in B61L- Granted patents
- 87
- Published applications
- 56
- Assignees
- 37
- Inventors
- 109
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 2 | 2 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 7 |
| 2012 | 2 | 0 |
| 2013 | 3 | 2 |
| 2014 | 2 | 5 |
| 2015 | 5 | 0 |
| 2016 | 2 | 5 |
| 2017 | 4 | 1 |
| 2018 | 1 | 7 |
| 2019 | 3 | 0 |
| 2020 | 5 | 2 |
| 2021 | 3 | 7 |
| 2022 | 5 | 4 |
| 2023 | 2 | 3 |
| 2024 | 4 | 2 |
| 2025 | 3 | 1 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for virtual block stick circuits7 Jul 2026US 12,673,707 B2BNSF Railway Company
- Railroad virtual track block system16 Jun 2026US 12,654,753 B2BNSF Railway Company
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle2 Jun 2026US 12,643,583 B2
- System and method for virtual block operational status control with long block time delay23 Dec 2025US 12,503,145 B2BNSF Railway Company
- Method and system for estimating temperature-related forces in railway lines11 Nov 2025US 12,466,451 B2KB Signaling Inc.
- Railroad virtual track block system8 Oct 2026US 2026/0307691 A1BNSF Railway Company
- System and method for virtual block operational status control with long block time delay30 Apr 2026US 2026/0116439 A1BNSF Railway Company
- System and method for virtual block stick circuits30 Jan 2025US 2025/0033679 A1BNSF Railway Company
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle9 May 2024US 2024/0149931 A1ALSTOM Holdings
- Railroad virtual track block system4 Jan 2024US 2024/0001975 A1BNSF Railway Company
Most cited
By later US patents
- Microprocessor based track circuit for occupancy detection and bidirectional code communication71US 4,498,650 AGeneral Signal Corporation · 1985
- Cab signal track code analyzer system32US 5,358,202 AConsolidated Rail Corporation · 1994
- Pulse code system for railroad track circuits30US 4,619,425 AAmerican Standard Inc. · 1986
- Train detection circuit27US 5,417,388 A1995
- Railway cab signal26US 5,330,134 AUnion Switch & Signal Inc. · 1994