US Patent Class 303
FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS



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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  MISCELLANEOUS
2  DF  MULTIPLE SYSTEMS
3  DF  .~ Fluid pressure and electric
4  DF  .~ Fluid pressure and vacuum
5  DF  MULTIPLE FLUID-RECEIVING DEVICES
6.01  DF  .~ Multiple motors
6.1  DF  .~.~ Brake and door
7  DF  .~.~ Sectional train
8  DF  .~.~.~ Multiple brake valves
9  DF  .~.~ Supplementary in emergency
9.61  DF  .~.~ Separate and simultaneous control
9.62  DF  .~.~ Apportioning control
9.63  DF  .~.~.~ Failure responsive
9.64  DF  .~.~.~ Motorcycle
9.65  DF  .~.~.~ Manual
9.66  DF  .~.~.~ For pneumatic system
9.67  DF  .~.~.~ Inertia
9.68  DF  .~.~.~.~ Inertia weight
9.69  DF  .~.~.~ Load
9.71  DF  .~.~.~ Having significant pressure control by front brake
9.72  DF  .~.~.~ Having multiple pistons affecting fluid flow
9.73  DF  .~.~.~ Having significant output feature
9.74  DF  .~.~.~.~ Multiple outlets
9.75  DF  .~.~.~ Detail
9.76  DF  .~.~ Spring operated motor
10  DF  WITH PUMP
11  DF  .~ Pressure control
12  DF  .~ Vacuum
13  DF  MULTIPLE CONTROL
14  DF  .~ Double heading
15  DF  .~ Fluid and electric
16  DF  .~.~ Automatic electric
17  DF  .~.~.~ Electric impulse
18  DF  EXTERIOR CONTROL
19  DF  .~ Deadman type
121  DF  SPEED-CONTROLLED
122  DF  .~ With failure responsive means
122.01  DF  .~.~ Traction failure
122.02  DF  .~.~ Antilock failure with warning
122.03  DF  .~.~ Failure related to brake condition (e.g., wear, sensor or switch operation) with indicator
122.04  DF  .~.~ Electric system failure (no warning)
122.05  DF  .~.~.~ Electronic or electric component (e.g., speed detector, failure sensing) with warning
122.06  DF  .~.~ ABS failure detected via time period of sensed wheel lock or wheel speed signal
122.07  DF  .~.~ Time signal error (no warning)
122.08  DF  .~.~ Active circuit testing
122.09  DF  .~.~ Pressure failure
122.1  DF  .~.~.~ With warning
122.11  DF  .~.~.~ Detected via stroke sensor
122.12  DF  .~.~.~ Pump failure detection
122.13  DF  .~.~.~ Auxiliary pressure failure
122.14  DF  .~.~.~.~ With warning
122.15  DF  .~.~.~ Pneumatic
123  DF  .~ For a tractor-trailer type vehicle
124  DF  .~.~ Electric brake
125  DF  .~ Automatic braking including speed governor or hydraulic retarder
126  DF  .~.~ Aircraft
127  DF  .~ Pneumatic
128  DF  .~.~ For a railway vehicle (e.g., train)
129  DF  .~.~.~ With speed governor (hydraulic or inertia)
130  DF  .~.~.~.~ Compared to fixed reference
131  DF  .~.~.~ Plural similar inputs
132  DF  .~.~.~ Speed responsive and other conditions (e.g., acceleration, pressure, track hazard, friction)
133  DF  .~.~.~ Traction control
134  DF  .~.~.~ Compared to fixed reference
135  DF  .~.~.~ Automatic
136  DF  .~.~.~ Pseudo-speed
137  DF  .~ Motorcycle
138  DF  .~ Speed, deceleration, or ABS indication
139  DF  .~ And traction control
140  DF  .~.~ With yaw control
141  DF  .~.~ With engine torque power take-off (PTO) control
142  DF  .~.~ Motor control
143  DF  .~.~ With four wheel drive or all wheel drive
144  DF  .~.~ Intersecting traction and skid occurrence
145  DF  .~.~ Odd condition (e.g., fuel supply cut-off, modulating valve)
146  DF  .~ With yaw control
147  DF  .~.~ From speed sensors
148  DF  .~.~ From split coefficient of friction (mu)
149  DF  .~ Split coefficient of friction (mu)
150  DF  .~ Specific mu determination
151  DF  .~ Traction-motor vehicle
152  DF  .~ Regenerative brakes
153  DF  .~ Lead signal control for antiskid
154  DF  .~ Multiple control signal with multiple threshold
155  DF  .~ Braking pressure demand or braking force desire
156  DF  .~ Pulse frequency or time period controlling pressure rebuild
157  DF  .~ Pressure release control
158  DF  .~ Pressure reapply control
159  DF  .~ Wheel pressure delay compared to reference
160  DF  .~ Pressure or specific condition (e.g., deceleration) determines wheel speed instead of direct speed sensor
161  DF  .~ Current or voltage ramp proportional to vehicle speed
162  DF  .~ Current control of linear piston drive motor
163  DF  .~ Slip ratio
164  DF  .~ Slip time versus nonslip time
165  DF  .~ Variable target slip values
166  DF  .~ Wheel speed sensor and braking pressure sensor
167  DF  .~ Brake force or pressure determined from speed sensors
168  DF  .~ Wheel generated pulse signal control (speed sensor)
169  DF  .~ Left or right speed comparison
170  DF  .~ Select high wheel speed versus select low
171  DF  .~ Wheel speed versus pseudo vehicle speed (e.g., from deceleration)
172  DF  .~.~ By direct feedback or instant wheel control
173  DF  .~.~ By comparison of plural wheel speeds
174  DF  .~ Previously stored wheel speed information
175  DF  .~ Incipient or imminent skid measured
176  DF  .~ Antilock control disabled or altered for acceleration or speed ranges
177  DF  .~ Sensing jerk, acceleration, or deceleration
178  DF  .~.~ Wheel deceleration to find velocity error
179  DF  .~.~ Rotary and linear inertia
180  DF  .~.~ Rotary inertia
181  DF  .~.~ Linear inertia or accelerometer (includes pendulum type)
182  DF  .~.~ Accelerometer versus wheel rotation sensor
183  DF  .~.~ Specific acceleration or deceleration determined electronically
184  DF  .~.~ Acceleration-deceleration versus timing
185  DF  .~.~ Sensing deceleration then acceleration
186  DF  .~ Front-rear axle apportioning or speed difference
187  DF  .~ Diagonal wheels apportioning arrangement
188  DF  .~ All wheel apportioning arrangement (e.g., cross coupling)
189  DF  .~ Independent control for each wheel
190  DF  .~ Four-wheel drive or all wheel drive
191  DF  .~ Odd condition or device detection (e.g., fluid or brake temperature, hill holder, anti-squeal controller, acoustic emission)
192  DF  .~.~ Vehicle inclination
193  DF  .~.~ With sonar or radar type sensor
194  DF  .~.~ Hop or bounce (from vibration or oscillation) signal
195  DF  .~.~ Spurious signal
196  DF  .~.~.~ For rough road
197  DF  .~.~ With feeler wheel
198  DF  .~.~ Speed and vehicle load condition (e.g., cargo)
199  DF  .~ Electric control circuit detail
112  DF  .~ Torque sensing
113.1  DF  .~ Having a valve system responsive to a wheel lock signal
113.2  DF  .~.~ With traction control
113.3  DF  .~.~.~ Including booster
113.4  DF  .~.~ Including a stroke sensor
113.5  DF  .~.~ With system apportioning control
114.1  DF  .~.~ Including hydraulic power booster
114.2  DF  .~.~.~ Parallel boosters
114.3  DF  .~.~ Including pneumatic power booster
115.1  DF  .~.~ System controlled by expansible chamber type modulator
115.2  DF  .~.~.~ Having electric control
115.3  DF  .~.~.~ Having vacuum motor control
115.4  DF  .~.~.~ Having pump pressure control
115.5  DF  .~.~.~.~ Pump pressure operates fluid motor
115.6  DF  .~.~.~ Including flywheel control (e.g., motorcycle type)
116.1  DF  .~.~ Including pump with system solenoid valve
116.2  DF  .~.~.~ Having pressure line isolated from master cylinder line
116.3  DF  .~.~ Vehicle wheel operated pump
116.4  DF  .~.~ System pump structure detail
117.1  DF  .~.~ Spool valve
118.1  DF  .~.~ Pneumatic (relay or motorman) type
119.1  DF  .~.~ System controlled by solenoid valve
119.2  DF  .~.~.~ System solenoid valve detail
119.3  DF  .~.~.~ Housing for plural solenoids
20  DF  ELECTRIC CONTROL
22.1  DF  LOAD CONTROL
22.2  DF  .~ Empty and load type
22.3  DF  .~.~ Alterable for different classes of service
22.4  DF  .~ Failure responsive
22.5  DF  .~ Responsive to fluid pressure spring
22.6  DF  .~ Railway vehicle
22.7  DF  .~.~ Detail
22.8  DF  .~ Detail
24.1  DF  INERTIA CONTROL
25  DF  AUTOMATIC AND DIRECT
26  DF  .~ Supplementary control pipe
27  DF  .~ Direct on control-pipe reduction
28  DF  AUTOMATIC
29  DF  .~ Supplementary control pipe
30  DF  .~ Supplementary reservoir pipe
31  DF  .~ Vacuum
32  DF  .~ Equilibrium
33  DF  .~ Equalizing valves
34  DF  .~.~ Rotary type
35  DF  .~ Synchronizing
36  DF  .~.~ Release
37  DF  .~.~ Quick action
38  DF  .~.~.~ Service
39  DF  .~.~.~ Control pipe to chamber
40  DF  .~ Application valve
41  DF  .~ Preliminary valve movement
42  DF  .~.~ Emergency preventers
43  DF  .~ Slow-reduction emergency
44  DF  .~ Secondary service operation
45  DF  .~ Positive-movement equalizing valve
46  DF  .~ Augmented feed to motor
47  DF  .~ Train rear end first
48  DF  DIRECT
49  DF  .~ Liquid link
50  DF  MOTORMAN'S VALVES
51  DF  .~ Conductor type
52  DF  .~ Multiple motors
53  DF  .~.~ Engine and train
54  DF  .~ Equalizing
55  DF  .~.~ Preliminary discharge
56  DF  .~ Details
*  DD  CHARGING
57  DF  .~ Plurality of pressures
58  DF  .~ Reuse
59  DF  .~ Outlet-pressure control
60  DF  .~.~ Maintaining
61  DF  .~ Intermittent
*  DD  .~ Motor
62  DF  .~.~ Motor-movement control
63  DF  .~.~ Failure-system pressure
64  DF  .~ Auxiliary reservoir
65  DF  .~.~ Motor remaining charged
66  DF  .~ Control pipe
67  DF  .~.~ Preventers
*  DD  RELEASING
68  DF  .~ Motor
69  DF  .~.~ Quick
70  DF  .~.~ Venting auxiliary reservoir
71  DF  .~.~ Fluid-pressure retracting
72  DF  .~.~ Delayed
73  DF  .~.~.~ Blow down
74  DF  .~.~.~ Graduated
75  DF  .~.~ Preventers
76  DF  .~.~.~ Motorman valve control
77  DF  .~.~.~ Control-pipe pressure
78  DF  .~.~.~ Auxiliary-reservoir control
79  DF  .~.~.~ Loaded valve
80  DF  .~ Auxiliary reservoir
81  DF  .~ Control pipe
82  DF  .~.~ By action of control-pipe pressure
83  DF  .~.~ To chamber
84.1  DF  FLOW RETARDER
84.2  DF  .~ Isolation valve
85  DF  SUPPLEMENTARY RESERVOIR
86  DF  MISCELLANEOUS OPERATIONS ON CONTROL PIPE
87  DF  PULSATION NEUTRALIZERS
89  DF  LOCKS
90  DF  PIPELESS VALVES
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  ABS throttle control
901  DF  ABS check valve detail
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DIGESTS
******************************
DIG 1  DD  Pressure comparison
DIG 2  DD  Brake control by pressure comparison
DIG 3  DD  .~ Electrical pressure sensor
DIG 4  DD  .~.~ Pressure signal used in electrical speed controlled braking circuit
DIG 5  DD  Acceleration peak detection
DIG 6  DD  Axle differential control
DIG 7  DD  Small tire digest
DIG 8  DD  Antichatter
DIG 9  DD  Plural processors
DIG 10  DD  Valve block integrating pump, valves, solenoid, accumulator, etc.
DIG 11  DD  Accumulator