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Class Information
Number: 303/28
Name: Fluid-pressure and analogous brake systems > Automatic
Description: Fluid from a local source is supplied to a motor by means of a valve operated in response to a change in pressure of the fluid in the control-pipe.










Sub-classes under this class:

Class Number Class Name Patents
303/40 Application valve 109
303/46 Augmented feed to motor 2
303/33 Equalizing valves 49
303/32 Equilibrium 3
303/45 Positive-movement equalizing valve 1
303/41 Preliminary valve movement 9
303/44 Secondary service operation 3
303/43 Slow-reduction emergency 4
303/29 Supplementary control pipe 15
303/30 Supplementary reservoir pipe 10
303/35 Synchronizing 11
303/47 Train rear end first 15
303/31 Vacuum 4


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8589045 System and method for determining a safe maximum speed of a vehicle Nov. 19, 2013
8423253 Automatic braking apparatus for a vehicle Apr. 16, 2013
8352142 Brake control apparatus and brake control method Jan. 8, 2013
8000870 Active brake pulsation control Aug. 16, 2011
7658453 Service brake relay with integrated quick release valve Feb. 9, 2010
7143853 Roll-related reactive system Dec. 5, 2006
6910744 Control device for compressed-air brakes Jun. 28, 2005
6655750 Combination inversion and relay or quick release valve assembly Dec. 2, 2003
6264290 Single-operation valve assembly for braking systems and the like Jul. 24, 2001
6238010 Electropneumatic brake valve with release and running modes May. 29, 2001
6186600 Automatic test connector adapter plate for AB pipe bracket Feb. 13, 2001
6106079 Brake system valve having an anti-compounding feature Aug. 22, 2000
6042197 Air-drying system, in particular for rail vehicles Mar. 28, 2000
5988766 Electropneumatical brake adaptor Nov. 23, 1999
5971498 Electro-pneumatic valve control Oct. 26, 1999
5758929 Variable capacity electropneumatic control valve Jun. 2, 1998
5721683 Electronic discrete brake control system for a train Feb. 24, 1998
5709436 Arrangement for connecting a test device to a railroad car brake control valve device Jan. 20, 1998
5695258 Railway manual brake control valve test unit Dec. 9, 1997
5673977 Fluid control system for tractor trailer brake system Oct. 7, 1997
5634696 Railway brake pipe bracket with access ports Jun. 3, 1997
5624163 Pressure medium actuated vehicle braking system Apr. 29, 1997
5577814 Full function skid control braking system for vehicles Nov. 26, 1996
5538332 Vibration insulating members for piston valve assembly Jul. 23, 1996
5518304 Filter arrangement and mounting in railway brake pipe bracket May. 21, 1996
5509727 Ralway automatic brake control valve test unit Apr. 23, 1996
5480218 Railway brake pipe bracket with access ports Jan. 2, 1996
5467246 Arrangement for emulating an H-type relay air valve which is utilized in a railway braking system Nov. 14, 1995
5464278 Fluid control system for tractor trailer brake system Nov. 7, 1995
5451099 Railway brake pipe bracket access plate Sep. 19, 1995
5409303 Full function skid control braking system for vehicles Apr. 25, 1995
5395164 Operating brake valve for an electrically and pneumatically actuated braking system in a motor vehicle Mar. 7, 1995
5346291 Fluid pressure control valve with valve member mounted on guide pin slidably carried by piston Sep. 13, 1994
5286095 Air brake emergency control valves Feb. 15, 1994
5284384 Spring brake valve Feb. 8, 1994
5261458 Pilot relay valve with load piston Nov. 16, 1993
5236250 Full-function valve for heavy duty semi-trailer brake systems Aug. 17, 1993
5190357 Air-actuated brake system for vehicles Mar. 2, 1993
5172958 Air brake control valve system Dec. 22, 1992
5056873 Adaptive air braking system with correction for second order transient effects Oct. 15, 1991
5046786 Combination brake valve module Sep. 10, 1991
5042883 Trailer braking system for a towing vehicle Aug. 27, 1991
4861115 Electrically-controlled motor vehicle brake system Aug. 29, 1989
4768556 Brake system and relay valves for railroad trains Sep. 6, 1988
4733919 Integrated pressure exhaust valve and fluid coupling Mar. 29, 1988
4653811 Relay valve device Mar. 31, 1987
4645271 Parking brake control system Feb. 24, 1987
4603919 Dual control pressure medium brake system Aug. 5, 1986
4586755 Railway brake control system arranged to limit maximum brake pressure during combined independent and automatic brake operation May. 6, 1986
4572319 Automatic vehicle braking system Feb. 25, 1986

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