B60T 15/18
Triple or other relay valves which allow step-wise application or release and
Official title: Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
B60T15/18 (Triple or other relay valves which allow step-wise application or release and) appears on 230 US grants and 131 published applications in this corpus.
Search patents in B60T- Granted patents
- 230
- Published applications
- 131
- Assignees
- 93
- Inventors
- 366
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 10 | 0 |
| 1978 | 11 | 0 |
| 1979 | 9 | 0 |
| 1980 | 6 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 5 | 0 |
| 1985 | 6 | 0 |
| 1986 | 10 | 0 |
| 1987 | 6 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 2 |
| 2003 | 0 | 2 |
| 2004 | 3 | 4 |
| 2005 | 3 | 3 |
| 2006 | 3 | 1 |
| 2007 | 1 | 3 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 2 | 0 |
| 2011 | 2 | 4 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 2 | 7 |
| 2015 | 4 | 6 |
| 2016 | 9 | 9 |
| 2017 | 8 | 11 |
| 2018 | 8 | 14 |
| 2019 | 13 | 10 |
| 2020 | 9 | 9 |
| 2021 | 11 | 13 |
| 2022 | 5 | 7 |
| 2023 | 12 | 10 |
| 2024 | 9 | 5 |
| 2025 | 5 | 4 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Relay valve for a compressed air system for a vehicle23 Jun 2026US 12,663,027 B2Knorr-Bremse Systeme fur Nutzfahrzeuge GmbH
- Pneumatic pressure control valve for a brake control system of a rail vehicle, and pneumatic control valve for a brake control system of a rail vehicle3 Mar 2026US 12,565,185 B2Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Electropneumatic equipment for a vehicle with an autonomous brake circuit supplied with backup pressure as a precaution30 Dec 2025US 12,509,036 B2KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
- Air processing unit, air managing system, pneumatic system and vehicle21 Oct 2025US 12,448,992 B2ZF CV Systems Global GmbH
- Trailer brake control module9 Sep 2025US 12,409,826 B2Zf Cv Systems Europe BV
- Trailer Vehicle and Trailer Control System8 Oct 2026US 2026/0307631 A1KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
- Control valve assembly for a hydraulic braking system of a vehicle connected to a trailer27 Aug 2026US 2026/0249825 A1Raicam Driveline S.R.L.
- Trailer control valve and method for controlling a trailer brake pressure21 May 2026US 2026/0138579 A1
- Emergency Valve1 Jan 2026US 2026/0001522 A1Crrc Qiqihar Rolling Stock Co., Ltd.
- Tractor protection valve and trailer control module for a vehicle, and associated method of manufacturing14 Aug 2025US 2025/0256691 A1Zf Cv Systems Europe BV
Most cited
By later US patents
- Method of determining maximum service brake reduction44US 6,487,488 B1New York Air Brake Corporation · 2002
- Trailer braking system for a towing vehicle41US 5,042,883 ALucas Industries public limited company · 1991
- Truck mounted pneumatic brake control system26US 4,653,812 AGeneral Signal Corporation · 1987
- Relay valve24US 4,096,884 ASloan Valve Company · 1978
- Full-function valve for heavy duty semi-trailer brake systems23US 5,236,250 AMidland Brake, Inc. · 1993