B61L 29/02
Guards or obstacles for preventing access to the route
Official title: Guards or obstacles for preventing access to the route (cattle guards connected to the permanent way E01B17/00)
B61L29/02 (Guards or obstacles for preventing access to the route) appears on 23 US grants and 16 published applications in this corpus.
Search patents in B61L- Granted patents
- 23
- Published applications
- 16
- Assignees
- 10
- Inventors
- 35
- Latest grant
- 19 Mar 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 2 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 4 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 3 | 3 |
| 2023 | 2 | 0 |
| 2024 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Double-sided terminal board for grade crossing gate controller19 Mar 2024US 11,932,297 B2C.D.L. Electric Company, Inc.
- Grade crossing gate arm position detection system10 Oct 2023US 11,780,479 B2C.D.L. Electric Company, Inc.
- User interface for grade crossing gate controller3 Oct 2023US 11,772,691 B2C.D.L. Electric Company, Inc.
- Double-sided terminal board for grade crossing gate controller16 Aug 2022US 11,414,109 B2C.D.L. Electric Company, Inc.
- Grade crossing gate arm position detection system12 Jul 2022US 11,383,742 B2C.D.L. Electric Company, Inc.
- Grade crossing gate arm position detection system27 Jun 2024US 2024/0208555 A1C.D.L. Electric Company, Inc.
- Double-sided terminal board for grade crossing gate controller1 Dec 2022US 2022/0379935 A1C.D.L. Electric Company, Inc.
- Grade crossing gate arm position detection system17 Nov 2022US 2022/0363300 A1C.D.L. Electric Company, Inc.
- User interface for grade crossing gate controller23 Jun 2022US 2022/0194442 A1C.D.L. Electric Company, Inc.
- User interface for grade crossing gate controller21 Nov 2019US 2019/0351920 A1C.D.L. Electric Company, Inc.
Most cited
By later US patents
- Barricade apparatus54US 5,118,056 A1992
- Ground retractable automobile barrier49US 5,762,443 AUniversal Safety Response, Inc. · 1998
- Railroad crossing gate37US 4,897,960 AGeneral Signals, Inc. · 1990
- Terrorist vehicle arresting system25US 4,759,655 AFlexible Barricades, Inc. · 1988
- Operating mechanism for railroad crossing gate20US 3,964,704 AHarmon Industries, Inc. · 1976