B61L 5/14
Form signals
Official title: Form signals, e.g. semaphore arms
B61L5/14 (Form signals) appears on 6 US grants and 4 published applications in this corpus.
Search patents in B61L- Granted patents
- 6
- Published applications
- 4
- Assignees
- 1
- Inventors
- 9
- Latest grant
- 4 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 2 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Fixed signage and method for use of same4 Mar 2025US 12,240,512 B2RailPros Field Services, Inc.
- High-speed railway switch device for moving railroad switch points17 Sep 2024US 12,091,071 B2
- Railroad switch position indicator5 Mar 2024US 11,919,553 B1
- Modular railroad switch stand22 Mar 2011US 7,909,294 B2
- Railway indicator device and method25 Apr 2006US 7,032,865 B2
- Fixed Signage and Method for Use of Same10 Nov 2022US 2022/0355837 A1RailPros Field Services, Inc.
- Railway switch device for moving railroad switch points6 May 2021US 2021/0129876 A1
- Modular Railroad Switch Stand4 Feb 2010US 2010/0025546 A1
- Railway indicator device and method10 Nov 2005US 2005/0247825 A1
Most cited
By later US patents