| Class 303 | FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS |
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![[List of Pre Grant Publications for class 303 subclass 1]](../as.gif) | ![[List of Patents for class 303 subclass 1]](../ps.gif) | 1 | MISCELLANEOUS |
| | 2 | MULTIPLE SYSTEMS |
| | 5 | MULTIPLE FLUID-RECEIVING DEVICES |
| | 6.01 |  Multiple motors |
| | 6.1 |  Brake and door |
| | 7 | Sectional train |
| | 9 | Supplementary in emergency |
| | 9.61 | Separate and simultaneous control |
| | 9.62 | Apportioning control |
| | 9.63 |  Failure responsive |
| | 9.64 | Motorcycle |
| | 9.65 | Manual |
| | 9.66 | For pneumatic system |
| | 9.67 | Inertia |
| | 9.69 | Load |
| | 9.71 | Having significant pressure control by front brake |
| | 9.72 | Having multiple pistons affecting fluid flow |
| | 9.73 | Having significant output feature |
| | 9.75 | Detail |
| | 9.76 | Spring operated motor |
| | 10 | WITH PUMP |
| | 13 | MULTIPLE CONTROL |
| | 18 | EXTERIOR CONTROL |
| | 121 | SPEED-CONTROLLED |
| | 122 | With failure responsive means |
| | 122.01 | Traction failure |
| | 122.02 | Antilock failure with warning |
| | 122.03 | Failure related to brake condition (e.g., wear, sensor or switch operation) with indicator |
| | 122.04 | Electric system failure (no warning) |
| | 122.06 | ABS failure detected via time period of sensed wheel lock or wheel speed signal |
| | 122.07 | Time signal error (no warning) |
| | 122.08 | Active circuit testing |
| | 122.09 | Pressure failure |
| | 123 | For a tractor-trailer type vehicle |
| | 125 | Automatic braking including speed governor or hydraulic retarder |
| | 127 | Pneumatic |
| | 137 | Motorcycle |
| | 138 | Speed, deceleration, or ABS indication |
| | 139 | And traction control |
| | 140 | With yaw control |
| | 141 | With engine torque power take-off (PTO) control |
| | 142 | Motor control |
| | 143 | With four wheel drive or all wheel drive |
| | 144 | Intersecting traction and skid occurrence |
| | 145 | Odd condition (e.g., fuel supply cut-off, modulating valve) |
| | 146 | With yaw control |
| | 149 | Split coefficient of friction (mu) |
| | 150 | Specific mu determination |
| | 151 | Traction-motor vehicle |
| | 152 | Regenerative brakes |
| | 153 | Lead signal control for antiskid |
| | 154 | Multiple control signal with multiple threshold |
| | 155 | Braking pressure demand or braking force desire |
| | 156 | Pulse frequency or time period controlling pressure rebuild |
| | 157 | Pressure release control |
| | 158 | Pressure reapply control |
| | 159 | Wheel pressure delay compared to reference |
| | 160 | Pressure or specific condition (e.g., deceleration) determines wheel speed instead of direct speed sensor |
| | 161 | Current or voltage ramp proportional to vehicle speed |
| | 162 | Current control of linear piston drive motor |
| | 163 | Slip ratio |
| | 164 | Slip time versus nonslip time |
| | 165 | Variable target slip values |
| | 166 | Wheel speed sensor and braking pressure sensor |
| | 167 | Brake force or pressure determined from speed sensors |
| | 168 | Wheel generated pulse signal control (speed sensor) |
| | 169 | Left or right speed comparison |
| | 170 | Select high wheel speed versus select low |
| | 171 | Wheel speed versus pseudo vehicle speed (e.g., from deceleration) |
| | 174 | Previously stored wheel speed information |
| | 175 | Incipient or imminent skid measured |
| | 176 | Antilock control disabled or altered for acceleration or speed ranges |
| | 177 | Sensing jerk, acceleration, or deceleration |
| | 178 | Wheel deceleration to find velocity error |
| | 179 | Rotary and linear inertia |
| | 180 | Rotary inertia |
| | 181 | Linear inertia or accelerometer (includes pendulum type) |
| | 182 | Accelerometer versus wheel rotation sensor |
| | 183 | Specific acceleration or deceleration determined electronically |
| | 184 | Acceleration-deceleration versus timing |
| | 185 | Sensing deceleration then acceleration |
| | 186 | Front-rear axle apportioning or speed difference |
| | 187 | Diagonal wheels apportioning arrangement |
| | 188 | All wheel apportioning arrangement (e.g., cross coupling) |
| | 189 | Independent control for each wheel |
| | 190 | Four-wheel drive or all wheel drive |
| | 191 | Odd condition or device detection (e.g., fluid or brake temperature, hill holder, anti-squeal controller, acoustic emission) |
| | 192 | Vehicle inclination |
| | 193 | With sonar or radar type sensor |
| | 194 | Hop or bounce (from vibration or oscillation) signal |
| | 195 | Spurious signal |
| | 197 | With feeler wheel |
| | 198 | Speed and vehicle load condition (e.g., cargo) |
| | 199 | Electric control circuit detail |
| | 112 | Torque sensing |
| | 113.1 | Having a valve system responsive to a wheel lock signal |
| | 113.2 | With traction control |
| | 113.4 | Including a stroke sensor |
| | 113.5 | With system apportioning control |
| | 114.1 | Including hydraulic power booster |
| | 114.3 | Including pneumatic power booster |
| | 115.1 | System controlled by expansible chamber type modulator |
| | 115.2 | Having electric control |
| | 115.3 | Having vacuum motor control |
| | 115.4 | Having pump pressure control |
| | 115.6 | Including flywheel control (e.g., motorcycle type) |
| | 116.1 | Including pump with system solenoid valve |
| | 116.3 | Vehicle wheel operated pump |
| | 116.4 | System pump structure detail |
| | 117.1 | Spool valve |
| | 118.1 | Pneumatic (relay or motorman) type |
| | 119.1 | System controlled by solenoid valve |
| | 20 | ELECTRIC CONTROL |
| | 22.1 | LOAD CONTROL |
| | 22.2 | Empty and load type |
| | 22.4 | Failure responsive |
| | 22.5 | Responsive to fluid pressure spring |
| | 22.6 | Railway vehicle |
| | 22.8 | Detail |
| | 24.1 | INERTIA CONTROL |
| | 25 | AUTOMATIC AND DIRECT |
| | 28 | AUTOMATIC |
| | 29 | Supplementary control pipe |
| | 30 | Supplementary reservoir pipe |
| | 31 | Vacuum |
| | 32 | Equilibrium |
| | 33 | Equalizing valves |
| | 35 | Synchronizing |
| | 40 | Application valve |
| | 41 | Preliminary valve movement |
| | 43 | Slow-reduction emergency |
| | 44 | Secondary service operation |
| | 45 | Positive-movement equalizing valve |
| | 46 | Augmented feed to motor |
| | 47 | Train rear end first |
| | 48 | DIRECT |
| | 50 | MOTORMAN'S VALVES |
| CHARGING |
| | 57 | Plurality of pressures |
| | 58 | Reuse |
| | 59 | Outlet-pressure control |
| | 61 | Intermittent |
| Motor |
| | 64 | Auxiliary reservoir |
| | 66 | Control pipe |
| RELEASING |
| | 68 | Motor |
| | 80 | Auxiliary reservoir |
| | 81 | Control pipe |
| | 84.1 | FLOW RETARDER |
| | 85 | SUPPLEMENTARY RESERVOIR |
| | 86 | MISCELLANEOUS OPERATIONS ON CONTROL PIPE |
| | 87 | PULSATION NEUTRALIZERS |
| | 89 | LOCKS |
| | 90 | PIPELESS VALVES |
| CROSS-REFERENCE ART COLLECTIONS | ||
| | 900 | ABS THROTTLE CONTROL |
| | 901 | ABS CHECK VALVE DETAIL |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| DIGESTS | ||
| | DIG1 | PRESSURE COMPARISON |
| | DIG2 | BRAKE CONTROL BY PRESSURE COMPARISON |
| | DIG5 | ACCELERATION PEAK DETECTION |
| | DIG6 | AXLE DIFFERENTIAL CONTROL |
| | DIG7 | SMALL TIRE DIGEST |
| | DIG8 | ANTICHATTER |
| | DIG9 | PLURAL PROCESSORS |
| | DIG10 | VALVE BLOCK INTEGRATING PUMP, VALVES, SOLENOID, ACCUMULATOR, ETC. |
| | DIG11 | ACCUMULATOR |
| | DIG12 | AIR OVER HYDRAULIC BRAKE SYSTEM |