B21K 7/02
Parts for permanent way
Official title: parts for permanent way (spikes B21K1/72)
B21K7/02 (Parts for permanent way) appears on 6 US grants and 5 published applications in this corpus.
Search patents in B21K- Granted patents
- 6
- Published applications
- 5
- Assignees
- 8
- Inventors
- 13
- Latest grant
- 18 Oct 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 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 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Switch device18 Oct 2022US 11,473,247 B2Voestalpine Bwg GmbH & Co. KG
- Hot forged tie plate for railroad30 Jun 2020US 10,697,129 B2Yangtze Railroad Materials
- Hot forged tie plate for railroad30 Apr 2019US 10,273,636 B2Yangtze Railroad Materials
- Profile transition rail and method for producing said rail1 May 2007US 7,210,636 B2VAE Eisenbahnsysteme GmbH
- Process for modifying the section of a railway rail and rail thus obtained18 Mar 1997US 5,611,234 AKihn
- Switch device9 Jul 2020US 2020/0217019 A1Voestalpine Bwg GmbH & Co. KG
- Hot Forged Tie Plate for Railroad11 Jul 2019US 2019/0211510 A1Yangtze Railroad Materials
- Hot Forged Tie Plate for Railroad1 Mar 2018US 2018/0058014 A1Yangtze Railroad Materials
- Method, apparatus and vehicle for welding rails24 Aug 2017US 2017/0241082 A1Network Rail Infrastructure Limited
- Profile transition rail and method for producing said rail4 Aug 2005US 2005/0167518 A1VAE Eisenbahnsysteme GmbH
Most cited
By later US patents
- Process for modifying the section of a railway rail and rail thus obtained7US 5,611,234 AKihn · 1997
- Method of making a resilient double C-shaped clip for securing a rail on a support and a clip made by the use of this method5US 4,025,044 AB.V. Schroefboutenfabriek v.h.Everts en van der Weijden · 1977
- Hot forged tie plate for railroad1US 10,273,636 B2Yangtze Railroad Materials · 2019