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Class Information
Number: 303
Name: Fluid-pressure and analogous brake systems >
Description: This class relates to the distribution of fluid to brake motors, i.e., the utilization of fluid-pressure in the operation of brakes.










Class Number Class Name No. of Patents
303/901

Abs check valve detail

84
303/900

Abs throttle control

124
303/DIG.5

Acceleration peak detection

21
303/DIG.11

Accumulator

87
303/DIG.12

Air over hydraulic brake system

3
303/DIG.8

Antichatter

12
303/25

Automatic and direct

5
303/27

Direct on control-pipe reduction

3
303/26

Supplementary control pipe

1
303/28

Automatic

65
303/40

Application valve

109
303/46

Augmented feed to motor

2
303/33

Equalizing valves

49
303/34

Rotary type

1
303/32

Equilibrium

3
303/45

Positive-movement equalizing valve

1
303/41

Preliminary valve movement

9
303/42

Emergency preventers

3
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
303/37

Quick action

34
303/39

Control pipe to chamber

10
303/38

Service

31
303/36

Release

38
303/47

Train rear end first

15
303/31

Vacuum

4
303/DIG.6

Axle differential control

38
303/DIG.2

Brake control by pressure comparison

67
303/DIG.3

Electrical pressure sensor

118
303/DIG.4

Pressure signal used in electrical speed controlled braking circuit

191
 

Charging

 
303/64

Auxiliary reservoir

15
303/65

Motor remaining charged

3
303/66

Control pipe

13
303/67

Preventers

7
303/61

Intermittent

74
 

Motor

 
303/63

Failure-system pressure

22
303/62

Motor-movement control

4
303/59

Outlet-pressure control

9
303/60

Maintaining

16
303/57

Plurality of pressures

18
303/58

Reuse

1
303/48

Direct

2
303/49

Liquid link

5
303/20

Electric control

688
303/18

Exterior control

26
303/19

Deadman type

27
303/84.1

Flow retarder

60
303/84.2

Isolation valve

72
303/24.1

Inertia control

74
303/22.1

Load control

98
303/22.8

Detail

71
303/22.2

Empty and load type

50
303/22.3

Alterable for different classes of service

2
303/22.4

Failure responsive

24
303/22.6

Railway vehicle

52
303/22.7

Detail

60
303/22.5

Responsive to fluid pressure spring

48
303/89

Locks

185
303/86

Miscellaneous operations on control pipe

82
303/1

Miscellaneous

82
303/50

Motorman's valves

56
303/51

Conductor type

3
303/56

Details

34
303/54

Equalizing

33
303/55

Preliminary discharge

1
303/52

Multiple motors

87
303/53

Engine and train

2
303/13

Multiple control

131
303/14

Double heading

52
303/15

Fluid and electric

517
303/16

Automatic electric

43
303/17

Electric impulse

7
303/5

Multiple fluid-receiving devices

9
303/6.01

Multiple motors

72
303/9.62

Apportioning control

147
303/9.75

Detail

119
303/9.63

Failure responsive

112
303/9.66

For pneumatic system

39
303/9.72

Having multiple pistons affecting fluid flow

41
303/9.73

Having significant output feature

54
303/9.74

Multiple outlets

31
303/9.71

Having significant pressure control by front brake

74
303/9.67

Inertia

56
303/9.68

Inertia weight

78
303/9.69

Load

122
303/9.65

Manual

11
303/9.64

Motorcycle

84
303/6.1

Brake and door

14
303/7

Sectional train

498
303/8

Multiple brake valves

23
303/9.61

Separate and simultaneous control

107
303/9.76

Spring operated motor

68
303/9

Supplementary in emergency

111
303/2

Multiple systems

99
303/3

Fluid pressure and electric

633
303/4

Fluid pressure and vacuum

17
303/90

Pipeless valves

0
303/DIG.9

Plural processors

51
303/DIG.1

Pressure comparison

21
303/87

Pulsation neutralizers

129
 

Releasing

 
303/80

Auxiliary reservoir

6
303/81

Control pipe

41
303/82

By action of control-pipe pressure

55
303/83

To chamber

6
303/68

Motor

104
303/72

Delayed

10
303/73

Blow down

3
303/74

Graduated

24
303/71

Fluid-pressure retracting

142
303/75

Preventers

5
303/78

Auxiliary-reservoir control

0
303/77

Control-pipe pressure

9
303/79

Loaded valve

2
303/76

Motorman valve control

4
303/69

Quick

65
303/70

Venting auxiliary reservoir

5
303/DIG.7

Small tire digest

17
303/121

Speed-controlled

77
303/188

All wheel apportioning arrangement (e.g., cross coupling)

26
303/139

And traction control

178
303/144

Intersecting traction and skid occurrence

32
303/142

Motor control

25
303/145

Odd condition (e.g., fuel supply cut-off, modulating valve)

24
303/141

With engine torque power take-off (pto) control

74
303/143

With four wheel drive or all wheel drive

25
303/140

With yaw control

243
303/176

Antilock control disabled or altered for acceleration or speed ranges

66
303/125

Automatic braking including speed governor or hydraulic retarder

71
303/126

Aircraft

109
303/167

Brake force or pressure determined from speed sensors

107
303/155

Braking pressure demand or braking force desire

393
303/162

Current control of linear piston drive motor

72
303/161

Current or voltage ramp proportional to vehicle speed

14
303/187

Diagonal wheels apportioning arrangement

46
303/199

Electric control circuit detail

48
303/123

For a tractor-trailer type vehicle

121
303/124

Electric brake

52
303/190

Four-wheel drive or all wheel drive

66
303/186

Front-rear axle apportioning or speed difference

179
303/113.1

Having a valve system responsive to a wheel lock signal

310
303/113.4

Including a stroke sensor

393
303/114.1

Including hydraulic power booster

343
303/114.2

Parallel boosters

29
303/114.3

Including pneumatic power booster

232
303/116.1

Including pump with system solenoid valve

489
303/116.2

Having pressure line isolated from master cylinder line

206
303/118.1

Pneumatic (relay or motorman) type

130
303/117.1

Spool valve

135
303/115.1

System controlled by expansible chamber type modulator

88
303/115.2

Having electric control

223
303/115.4

Having pump pressure control

299
303/115.5

Pump pressure operates fluid motor

27
303/115.3

Having vacuum motor control

50
303/115.6

Including flywheel control (e.g., motorcycle type)

45
303/119.1

System controlled by solenoid valve

267
303/119.3

Housing for plural solenoids

191
303/119.2

System solenoid valve detail

476
303/116.4

System pump structure detail

207
303/116.3

Vehicle wheel operated pump

23
303/113.5

With system apportioning control

235
303/113.2

With traction control

370
303/113.3

Including booster

139
303/175

Incipient or imminent skid measured

19
303/189

Independent control for each wheel

72
303/153

Lead signal control for antiskid

12
303/169

Left or right speed comparison

61
303/137

Motorcycle

77
303/154

Multiple control signal with multiple threshold

56
303/191

Odd condition or device detection (e.g., fluid or brake temperature, hill holder, anti-squeal controller, acoustic emission)

320
303/194

Hop or bounce (from vibration or oscillation) signal

36
303/198

Speed and vehicle load condition (e.g., cargo)

52
303/195

Spurious signal

42
303/196

For rough road

35
303/192

Vehicle inclination

79
303/197

With feeler wheel

2
303/193

With sonar or radar type sensor

47
303/127

Pneumatic

40
303/128

For a railway vehicle (e.g., train)

66
303/135

Automatic

14
303/134

Compared to fixed reference

5
303/131

Plural similar inputs

1
303/136

Pseudo-speed

4
303/132

Speed responsive and other conditions (e.g., acceleration, pressure, track hazard, friction)

14
303/133

Traction control

17
303/129

With speed governor (hydraulic or inertia)

0
303/130

Compared to fixed reference

3
303/160

Pressure or specific condition (e.g., deceleration) determines wheel speed instead of direct speed sensor

18
303/158

Pressure reapply control

91
303/157

Pressure release control

63
303/174

Previously stored wheel speed information

71
303/156

Pulse frequency or time period controlling pressure rebuild

125
303/152

Regenerative brakes

247
303/170

Select high wheel speed versus select low

56
303/177

Sensing jerk, acceleration, or deceleration

49
303/184

Acceleration-deceleration versus timing

17
303/182

Accelerometer versus wheel rotation sensor

30
303/181

Linear inertia or accelerometer (includes pendulum type)

12
303/179

Rotary and linear inertia

1
303/180

Rotary inertia

3
303/185

Sensing deceleration then acceleration

16
303/183

Specific acceleration or deceleration determined electronically

40
303/178

Wheel deceleration to find velocity error

34
303/163

Slip ratio

87
303/164

Slip time versus nonslip time

15
303/150

Specific mu determination

140
303/138

Speed, deceleration, or abs indication

50
303/149

Split coefficient of friction (mu)

107
303/112

Torque sensing

135
303/151

Traction-motor vehicle

60
303/165

Variable target slip values

49
303/168

Wheel generated pulse signal control (speed sensor)

78
303/159

Wheel pressure delay compared to reference

70
303/166

Wheel speed sensor and braking pressure sensor

118
303/171

Wheel speed versus pseudo vehicle speed (e.g., from deceleration)

35
303/173

By comparison of plural wheel speeds

56
303/172

By direct feedback or instant wheel control

14
303/122

With failure responsive means

109
303/122.06

Abs failure detected via time period of sensed wheel lock or wheel speed signal

69
303/122.08

Active circuit testing

69
303/122.02

Antilock failure with warning

31
303/122.04

Electric system failure (no warning)

82
303/122.05

Electronic or electric component (e.g., speed detector, failure sensing) with warning

100
303/122.03

Failure related to brake condition (e.g., wear, sensor or switch operation) with indicator

58
303/122.09

Pressure failure

90
303/122.13

Auxiliary pressure failure

61
303/122.14

With warning

19
303/122.11

Detected via stroke sensor

45
303/122.15

Pneumatic

16
303/122.12

Pump failure detection

39
303/122.1

With warning

34
303/122.07

Time signal error (no warning)

26
303/122.01

Traction failure

25
303/146

With yaw control

408
303/147

From speed sensors

125
303/148

From split coefficient of friction (mu)

91
303/85

Supplementary reservoir

39
303/DIG.10

Valve block integrating pump, valves, solenoid, accumulator, etc.

128
303/10

With pump

351
303/11

Pressure control

235
303/12

Vacuum

33
 
 
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