U.S. PATENT AND TRADEMARK OFFICE
Information Products Division |
U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
Patents classified in a subclass may be accessed by either clicking on
the subclass number
preceding each subclass definition or on the
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( please note that patents for some subclasses may not be available )
For classification search strategies, please refer to the
Classification Index
Explanation of Data web page.
(definitions have been obtained from the
Patents ASSIST CD-ROM which
is produced by the U.S. Patent and Trademark Office
Electronic Products Branch)
Class 303
FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS
Class Definition:
This class relates to the distribution of fluid to brake
motors, i.e., the utilization of fluid-pressure in the
operation of brakes.
LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
Systems for the distribution of pressure fluid to a plurality
of motors other than brake motors are, for the most part in
Class 60, Power Plants, subclasses 6, 97, 420, 484, and their
respective indented subclasses, and Class 91, Motors:
Expansible Chamber Type, subclasses 165+ and 508+.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS:
60, Power Plants, 325 for a pressure fluid source supply
motive fluid to an output motor of general utility,
particularly subclasses 533+ a master-slave system. See the
Search Class reference to Class 303 in subclass 533 of Class
60 for the line between these classes as to pulsators.
73, Measuring and Testing, subclass 39 for devices for
testing fluid brake systems and triple valves.
91, Motors: Expansible Chamber Type, 508 for a system of
plural expansible chamber motors of general utility and
appropriate subclass for an expansible chamber motor, per
se.
96, Gas Separation: Apparatus, for apparatus for gas
separation, per se, which merely dry or separate foreign
matter from gaseous brake fluids or which deaerate brake
liquids.
116, Signals and Indicators, subclass 55 for signal
train-pipes supplied with fluid under pressure, the train
brake-pipe, when used for signaling, being found in this
subclass.
137, Fluid Handling, appropriate subclasses for fluid
handling systems of more general application, and in
particular see 203 for devices for collecting and
discharging condensate from a low point in the system,
subclass 381 for shields to protect exposed valves,
subclasses 545+ for devices for separating foreign matter
from the brake fluid, and subclass 598 for distribution
systems including a flow passage between a master cylinder
and a brake cylinder and means to control the fluid flow,
e.g., "hill holders", and see the Note to the definition of
this subclass (598).
188, Brakes, 152 and 154 for application of fluid-pressure
operated brakes to motor-vehicles and to all road-vehicles.
246, Railway Switches and Signals, 167 for operations on the
air-distribution system from points on the railway-track.
252, Compositions, for fluids for hydraulic brakes or for
other hydraulic devices.
293, Vehicle Fenders, subclass 5 for the application of a
fluid pressure operated brake to a motor vehicle combined
with vehicle fender structure.
418, Rotary Expansible Chamber Devices, for rotary expansible
chamber, per se.
700, Data Processing: Generic Control Systems or Specific
Applications, subclasses 1-89 for generic data processing
control systems.
SUBCLASSES
Subclass:
1
Patents not elsewhere classified.
Subclass:
2
Patents showing systems of distribution to two or more motive
devices associated in one system, one of which must be a
fluid-pressure motive device.
Subclass:
3
A motor operated by a fluid is associated with an electric
motive device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
15 for distribution of fluid controlled by fluid and
electric means.
121 for a speed controlled braking system that controls
fluid braking pressure.
Subclass:
4
Fluid is used at two pressures, the one above atmospheric and
the other at atmospheric pressure, in opposition to a partial
vacuum.
(1) Note. See this class, subclasses 12 and 31 for cases in
which a vacuum alone is used.
Subclass:
5
The fluid is distributed to a plurality of receivers, one of
which must be a brake motor.
(1) Note. Devices which control brake fluid in response to
a speed responsive actuating signal have been excluded from
this subclass and its indented subclasses and are found in
subclasses 121+ below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30 for patents in which an additional pipe is used to feed
the auxiliary reservoir.
121 for speed controlled regulation of braking fluid and,
therefore, braking action.
Subclass:
6.01
Multiple motors:
This subclass is indented under subclass 5. Subject matter
wherein the fluid is distributed to a plurality of fluid
pressure operated motors.
(1) Note. The multiple motors are usually differently
related to the means for distributing the fluid.
Subclass:
6.1
Includes patents in which one of the motors operates a door.
SEE OR SEARCH CLASS:
49, Movable or Removable Closures, subclass 334 for a motor
driven closure and see the search notes thereto for the loci
of other closures driven by a motor.
105, Railway Rolling Stock, the subclasses indented under
subclass 238.1 for door operation and door actuators.
Subclass:
7
The train is divided into a plurality of sections, the fluid
being distributed to the sections in different manner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 for motorman's valves adapted for this service.
Subclass:
8
The distribution of fluid to the sections of the train is
controlled by a plurality of brake-valves.
SEE OR SEARCH THIS CLASS, SUBCLASS:
25 and 26, for other patents combining automatic and direct
distribution.
Subclass:
9
Upon a heavy reduction of control-pipe pressure a second
motor is brought into operation.
Subclass:
9.61
Separate and simultaneous control:
This subclass is indented under subclass 6.01. Subject
matter including means for regulating the fluid flow to the
motors such that one to the motors may be operated (a)
independent of another motor and (b) in unison with the other
motor, when desired.
(1) Note. This subclass may also include the sequential
control of fluid pressure operated motors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 for manually controlled valves where details of the
manual operation are significant.
SEE OR SEARCH CLASS:
188, Brakes, subclass 16 and 354 for independently operated
brakes.
Subclass:
9.62
Apportioning control:
This subclass is indented under subclass 6.01. Subject
matter including means for varying the fluid flow to one
motor relative to the flow to another motor, e.g., for
varying the braking action of a form brake motor with respect
to rear brake motor of a vehicle.
SEE OR SEARCH CLASS:
188, Brakes, particularly subclass 349 for details of
apportioning devices brake structure.
Subclass:
9.63
Failure responsive:
This subclass is indented under subclass 9.62. Subject
matter including a feature which functions when the
distribution of fluid ceases to occur properly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
84.1 for flow retarders and isolation valves which interrupt
the fluid flow, usually upon the failure of some part of the
system.
Subclass:
9.64
Motorcycle:
This subclass is indented under subclass 9.62. Subject
matter wherein the fluid is distributed to the fluid pressure
operated motors of a motorized land vehicle having a single
from wheel and at least one rear wheel, e.g., a motorized
velocipede.
SEE OR SEARCH CLASS:
188, Brake, subclass 344 for velocipede brake structure.
Subclass:
9.65
Manual:
This subclass is indented under subclass 9.62. Subject
matter wherein the means for varying the fluid flow may be
actuated by a human operator.
Subclass:
9.66
For pneumatic system:
This subclass is indented under subclass 9.62. Subject
matter wherein the fluid being distributed is pressurized
air.
(1) Note. The air pressure may be in the form of a vacuum.
(2) Note. The system may also include hydraulic portions.
Subclass:
9.67
Inertia:
This subclass is indented under subclass 9.62. Subject
matter wherein the means for varying the fluid flow includes
means responsive to a resistance to acceleration, i.e., to
inertia.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24.1 for means for controlling fluid distribution by inertia
in systems no to the apportioning type.
Subclass:
9.68
Inertia weight:
This subclass is indented under subclass 9.67. Subject
matter wherein significance is attributed to a moveable mass
responsive to inertia for varying the fluid flow.
Subclass:
9.69
Load:
This subclass is indented under subclass 9.62. Subject
matter wherein the means for varying the fluid flow includes
means responsive to a gravity induced load on a supporting
machine, e.g., a land vehicle.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22.1 for means for controlling fluid distribution affected
by a load but not of the apportioning type.
Subclass:
9.71
Having significant pressure control by front brake:
This subclass is indented under subclass 9.62. Subject
matter wherein the means for varying the fluid flow is
substantially affected by the amount of fluid pressure
present in a fluid line connected to a fluid pressure
operated, forward motor used for stopping a vehicle.
(1) Note. While many front/rear apportioning valves in
tandem brake systems have a front pressure line connected
thereto, significance with relation to affected apportioning
valve operation must be claimed for a patent to be considered
as an original classification in this subclass.
Subclass:
9.72
Having multiple pistons affecting fluid flow:
This subclass is indented under subclass 9.62. Subject
matter where in the mean for varying the fluid flow includes
plural fluid propelling shafts to the fluid pressure operated
motors.
Subclass:
9.73
Having significant output feature:
This subclass is indented under subclass 9.62. Subject
matter wherein the means for varying the fluid flow includes
mean for importantly affecting the flow to a fluid pressure
operated motor.
Subclass:
9.74
Multiple outlets:
This subclass is indented under subclass 9.73. Subject
matter having plural means for importantly affecting the
flow.
Subclass:
9.75
Detail:
This subclass is indented under subclass 9.62. Subject
matter wherein significance is attributed to a specific
component of a fluid distribution system.
(1) Note. Included herein are control valve and system
features relating to linkages, seals, springs and other parts
of special importance.
Subclass:
9.76
Spring operated motor:
This subclass is indented under subclass 6.01. Subject
matter wherein one of the motors includes a resilient
component working in opposition to the fluid pressure of the
motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
71 for fluid pressure retracting systems often used with
spring operated motors.
SEE OR SEARCH CLASS:
188, Brakes, particularly subclass 170 for spring applied,
fluid pressure released brakes, per se.
Subclass:
10
The fluid-distribution system is combined with a pump for
accumulating a supply for use of the system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
116.1 for anti-lock brake system pump with a solenoid
valve.
SEE OR SEARCH CLASS:
417, Pumps, for pumps, per se.
Subclass:
11
The action of the pump is controlled by the pressure of the
fluid pumped up.
SEE OR SEARCH CLASS:
417, Pumps, 1 for condition responsive control of a pump
drive motor and 279+ for condition responsive pumped fluid
control.
Subclass:
12
The system includes devices for creating a partial vacuum.
SEE OR SEARCH CLASS:
417, Pumps, 151 for jet pumps.
Subclass:
13
The distribution of the fluid is controlled by a plurality of
means.
Subclass:
14
Devices in which, while there is a plurality of means for
controlling the distribution of the fluid, when the system is
in operation the control is assumed by one, the others being
suppressed.
Subclass:
15
The distribution of the fluid is controlled by change of
pressure in the control-pipe and by electric operation of the
distributing-valves.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for a fluid and electric distribution system.
121 for a speed controlled braking system that controls
fluid braking pressure.
Subclass:
16
The electric valves are operated to reduce the pressure in
the control-pipe, and thus give an automatic operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
28 for the use of the word "automatic"..
Subclass:
17
Upon the initiation of distribution at the first unit, a
circuit is closed to continue the action electrically on
other units. A current-generator may be operated upon the
initial action to furnish current for the subsequent actions
on other units.
Subclass:
18
Control of system of distribution by appliances outside of
and not forming part of the system.
SEE OR SEARCH CLASS:
246, Railway Switches and Signals, particularly 167.
Subclass:
19
Distribution of the fluid is initiated upon some failure of
the operator.
SEE OR SEARCH CLASS:
180, Motor Vehicles, 272 for a motor vehicle provided with
safety-promoting means which is responsive to the incapacity
or absence of its operator.
Subclass:
20
The distribution is controlled electrically.
SEE OR SEARCH THIS CLASS, SUBCLASS:
121 for and electric speed control brake system.
Subclass:
22.1
LOAD CONTROL:
This subclass is indented under the class definition.
Subject matter wherein int distribution of fluid to the brake
motors of a machine, e.g., a vehicle, is regulated by means
which responds to the weight of a gravity loading on the
machine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9.69 for a load responsive type apportioning control.
Subclass:
22.2
Empty and load type:
This subclass is indented under subclass 22.1. Subject
matter wherein the regulating means responds in one manner of
the machine does not have a gravity loading on it and in a
different manner in the presence of a such a loading.
Subclass:
22.3
Alterable for different classes of service:
This subclass is indented under subclass 22.2. Subject
matter wherein the regulating means is capable of being
changed so that it may be used for another type of
application e.g., used on a passenger a high speed express,
or a freight type vehicle.
Subclass:
22.4
Failure responsive:
This subclass is indented under subclass 22.1. Subject
matter including a feature which functions when the
distribution of fluid ceases to occur properly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
84.1 for flow retarders and isolation valves which interrupt
the fluid flow usually upon the failure of some part of the
system.
SEE OR SEARCH CLASS:
188, Brakes, 151 for fluid pressure operated brakes often
having safety devices.
200, Electricity: Circuit Makers and Breakers, 82 for a
fluid pressure piston which is used as an operator to open of
close a circuit and often used in an automobile.
340, Communication: Electrical, 52 for means automatically
responsive to a condition of a vehicle, e.g., a brake fluid
pressure monitor.
Subclass:
22.5
Responsive to fluid pressure spring:
This subclass is indented under subclass 22.1. Subject
matter wherein the regulating means is affected by fluid
pressure generated by the action of hydraulic or pneumatic
suspension means used to help support the gravity loading.
Subclass:
22.6
Railway vehicle:
This subclass is indented under subclass 22.1. Subject
matter wherein the regulating means is intended for use on a
rail guided and supported conveyance.
(1) Note. While the term "railway" or similar terminology
may not always be claimed, a patent is considered to be
proper hereunder as an original classification of its
disclosure limits it to use in a railway vehicle.
Subclass:
22.7
Detail:
This subclass is indented under subclass 22.6. Subject
matter wherein significance is attributed to a specific
component of a fluid distribution system.
(1) Note. Included herein are control valve and system
features relating to linkages, seals, springs, valve
structure, adjustments and other parts of special
importance.
Subclass:
22.8
Detail:
This subclass is indented under subclass 22.1. Subject
matter wherein significance is attributed to a specific
component of a fluid distribution system.
(1) Note. Included herein are control valve and system
features relating to linkage, seals, springs, valve
structure, adjustments and other parts of special
importance.
Subclass:
24.1
INERTIA CONTROL:
This subclass is indented under the class definition.
Subject matter wherein the distribution of fluid is regulated
by meas which is responsive to a resistance to acceleration,
i.e., inertia.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9.67 for means for controlling fluid distribution by inertia
in apportioning type systems.
Subclass:
25
The fluid is fed to the motor through both an automatic and a
direct operation.
(1) Note. The word "direct" is used in the sense that the
fluid is fed from the control-pipe into the motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
28 for the use of the word "automatic"..
Subclass:
26
The fluid is fed to the motor through an automatic and a
direct operation, an additional control-pipe being used.
Subclass:
27
There is both an automatic and a direct operation, the direct
operation taking place upon a reduction in control-pipe
pressure.
Subclass:
28
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.
Subclass:
29
Systems with supplementary control-pipe, the action being
automatic with each pipe.
Subclass:
30
Automatic systems with an additional pipe connected to
pressure-supply on the different units.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 for cases of general application in which a motor and
other receptacle are supplied.
Subclass:
31
Systems in which through a change of pressure in the
control-pipe the motor is operated by pressure of atmosphere
in opposition to a partial vacuum.
(1) Note. For cases in which vacuum operation is used in
systems with pressure above atmospheric see this class,
subclass 4.
(2) Note. See also this class, subclass 12 for systems
including devices for producing a vacuum.
Subclass:
32
The piston of the motor is held inactive between two equal
pressures, the action of the motor occurring upon the
expansion of compressed fluid on one side when the fluid on
the other side is permitted to escape.
Subclass:
33
A valve which in one position connects the control-pipe to
the auxiliary reservoir and the motor to atmosphere and which
upon reduction of pressure in the control-pipe connects the
auxiliary reservoir to the motor.
(1) Note. The devices included in this subclass are what
are known as "plain triple valves". Equalizing-valves having
functions in addition to those just enumerated will be found
under various headings implying the nature of these
functions.
Subclass:
34
A valve in which a diaphragm moving upon the rise and fall of
pressure in the control-pipe operates a rotary valve to
perform the equalizing-valve functions, as set forth in the
preceding subclass.
(1) Note. These valve structures may have functions in
addition to those of the plain triple type, in which case the
patents will be cross-referenced into the appropriate
subclass.
Subclass:
35
Devices to effect a simultaneous application of fluid to the
motors of a series similarly related to the control-pipe.
Subclass:
36
Devices to effect the simultaneous release of fluid from the
motors in a series similarly related to the control-pipe.
Subclass:
37
Devices designed to produce a simultaneous application of
fluid to the motors of a series, the method being to secure a
momentary exhaust of fluid from the control-pipe to the
atmosphere through each equalizing-valve as the control-pipe
pressure is lowered for an emergency operation.
(1) Note. Consult this class, subclass 82 for other devices
for momentary exhaust of control-pipe fluid upon sudden
lowering of pressure.
Subclass:
38
Devices designed to produce a simultaneous application of
fluid to the motors of a series, the method being to secure a
momentary exhaust of fluid from the control-pipe through the
equalizing-valve as the control-pipe pressure is lowered for
a service operation.
Subclass:
39
Upon lowering the pressure in the control-pipe the fluid
exhausts into a closed chamber.
(1) Note. The chamber may be and usually is the
motor-chamber. This chamber is usually at atmospheric
pressure at the beginning of the operation.
Subclass:
40
A valve having a diaphragm to be moved by increasing
fluid-pressure to connect a source of pressure to a motor.
(1) Note. The fluid-pressure to move the diaphragm is
usually supplied by the operation of an equalizing-valve.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclass 627.5 for system including
closing and opening alternately seating floe controllers.
Subclass:
41
Devices for counteracting the effects of unauthorized valve
movements due to slight variations in control-pipe pressure.
Subclass:
42
Devices for preventing an undesired emergency operation of an
equalizing-valve after a series of slight reductions in
control-pipe pressure.
Subclass:
43
Devices to assure production of emergency operation
regardless of the extent of previous service operations.
Subclass:
44
Devices operating to obtain additional pressure in the motor
after equalization for an ordinary series of service
operations.
Subclass:
45
Devices for moving the equalizing-valve main piston by means
other than the usual unbalancing of pressures in control-pipe
and local supply. The purpose is usually to move the piston
to release position when stuck.
Subclass:
46
Provisions for further supply of fluid to the motor through
the equalizing-valve to reinforce or supplement the auxiliary
reservoir.
(1) Note. See this class, subclass 85 for examples of
supplementary reservoirs for various purposes.
Subclass:
47
The motors in a train are charged beginning with the rear
end.
Subclass:
48
Systems in which the motor is fed from the supply of fluid in
the control-pipe upon an increase of pressure in the
control-pipe.
SEE OR SEARCH CLASS:
188, Brakes, subclass 151 for fluid- pressure-operated
brakes, and 152+ and 154 for fluid-pressure brakes adapted to
use on a motor-vehicle.
Subclass:
49
Direct systems in which a liquid column is interposed between
the impelling power and the motor.
Subclass:
50
Valves operated directly by a the motorman adapted to connect
the source of fluid-supply to the motor.
Subclass:
51
Valves placed in the control-pipe and adapted to be operated
by some one other than the motorman.
Subclass:
52
Motorman's valves adapted to connect the fluid-supply to a
plurality of motors, usually differently related to the
distributing agency.
Subclass:
53
Motorman's valves for controlling motors differently situated
with respect to a plurality of train-sections.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for systems of this type.
Subclass:
54
Motorman's valves adapted to cut off the flow when the
outlet-pressure reaches a certain value.
SEE OR SEARCH THIS CLASS, SUBCLASS:
59
Subclass:
55
Motorman's valves in which a diaphragm is balanced by
opposing pressures, the valve containing means for modifying
the relation of the opposing pressures to permit the
control-pipe pressure to reduce to any desired point.
Subclass:
56
Elementary parts.
Subclass:
57
Devices for rendering available for use fluid at more than
one pressure.
Subclass:
58
The fluid after being used in one portion of the apparatus is
conveyed into another portion before being permitted to
exhaust into the atmosphere.
Subclass:
59
Charging devices adapted to cut off the flow of fluid when
the outlet-pressure reaches a certain valve.
(1) Note. Search this class, subclass 54 for motorman's
valves having this feature.
SEE OR SEARCH CLASS:
137, Fluid Handling, 505 for fluid pressure regulators, per
se.
Subclass:
60
Charging devices adapted to cut off the flow of fluid when
the outlet-pressure reaches a certain valve, but to continue
the charging when the outlet-pressure falls.
Subclass:
61
Parts of the system are charged with fluid in impulses.
Subclass:
62
After the initial charge the further charging of the motor
with fluid is determined by the motor movement.
SEE OR SEARCH CLASS:
91, Motors: Expansible Chamber Type, 358 for expansible
chamber motors having feedback control.
Subclass:
63
Upon a reduction of pressure in the system to a point which
may endanger control devices act to charge the motor.
SEE OR SEARCH CLASS:
116, Signals and Indicators, subclass 70 for analogous
devices in which the same conditions result in a signal being
given.
Subclass:
64
Means in addition to the usual leak-in groove for charging
the auxiliary reservoir.
(1) Note. This subclass contains patents in which the
movement of the equalizing-valve to application position is
caused by the increase of auxiliary-reservoir pressure.
Subclass:
65
Means for charging the auxiliary reservoir without releasing
the motor.
Subclass:
66
Means for charging the brake-pipe with fluid.
(1) Note. These devices are usually directed to reinforcing
the pipe-pressure at one or more places along the line for
the purpose of accelerating release of the motor.
Subclass:
67
Means for preventing the undesirable charging of the
brake-pipe.
Subclass:
68
Means for releasing fluid-pressure from the motor.
Subclass:
69
Means for securing rapid release of the motor, usually
through other than the regular channels.
Subclass:
70
Means for releasing the motor by venting fluid from the
auxiliary reservoir, and thus permitting the equalizing-valve
to move to release position.
Subclass:
71
The motor is forced to release position by the pressure of
fluid.
SEE OR SEARCH CLASS:
188, Brakes, subclass 170 for fluid pressure release of
spring applied brakes and see the search notes thereunder.
Subclass:
72
Release of motor is retarded.
Subclass:
73
The motor is partially released through a loaded valve that
permits a more or less slow reduction of pressure.
Subclass:
74
Means for repeatedly placing the equalizing-valve in release
position, then returning it to lap or blanked position, in
this way releasing the motor by steps.
Subclass:
75
Devices for preventing the release of the motor.
(1) Note. These are known as "pressure- retainers".
Subclass:
76
Devices for preventing the release of the motor by means of
the manipulation of a valve under the control of the
motorman.
SEE OR SEARCH THIS CLASS, SUBCLASS:
8 for other patents having this type of release-preventers.
Subclass:
77
The release of the motor is prevented by a valve responsive
to changes of pressure in the brake-pipe.
Subclass:
78
The release of the motor is prevented by a valve responsive
to changes in pressure in the auxiliary reservoir.
Subclass:
79
The release of the motor is prevented by a valve loaded by
means of a spring or a weight.
Subclass:
80
Means for releasing fluid-pressure from the auxiliary
reservoir.
Subclass:
81
Means for releasing fluid-pressure from the control-pipe.
(1) Note. Devices for controlling the release to the extent
of stopping it are also included in this subclass.
Subclass:
82
Upon a sudden fall in pipe-pressure a valve is opened to
permit a momentary discharge of fluid into the external
atmosphere.
SEE OR SEARCH THIS CLASS, SUBCLASS:
37 38 for similar action.
Subclass:
83
Fluid is released from the brake-pipe into a chamber.
(1) Note. This is comparable to the action of the
equalizing-valves in this class, subclass 39.
Subclass:
84.1
FLOW RETARDER:
This subclass is indented under the class definition.
Subject matter including means for interrupting movement of
fluid as it is being distributed.
(1) Note. The flow is usually being interrupted due to a
failure of some part of the system.
SEE OR SEARCH CLASS:
137, Fluid Handling, particularly 602 for a device with
multiple inlets and a single outlet for regulating fluid
flow.
Subclass:
84.2
Isolation valve:
This subclass is indented under subclass 84.1. Subject
matter wherein a specific controlling mechanism, i.e., a
valve is used to cut off and separate a portion of a fluid
distribution system form another portion.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9.63 for failure responsive apportioning control of multiple
motors.
63 for valves responsive to system failure and which charge
a motor.
SEE OR SEARCH CLASS:
60, Power Plants, particularly subclass 535 for a pulsator
with a failure indicator and subclasses 581 and 582 for
pulsator structure that provides safety structure.
137, Fluid Handling, particularly 112 for a valve that
selects the highest inlet pressure.
188, Brakes, 151 for fluid pressure operated brakes often
having safety devices.
200, Electricity: Circuit Makers and Breakers, 82 for a
fluid pressure piston which is used as an operator to open or
close a circuit and often used in a automobile.
340, Communications: Electrical, 52 for means automatically
responsive to a condition to a vehicle, e.g., a brake fluid
pressure monitor.
Subclass:
85
Additional reservoirs, in most cases supplementary to the
auxiliary reservoir.
Subclass:
86
Patents not otherwise classifiable for means of operating on
the control-pipe.
Subclass:
87
Devices to neutralize the effects of a surge of fluid
resulting from the sudden closure of a pipe under high
pressure.
SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, 37 for a device which
regulates the flow of fluid to neutralize the surge of
fluid.
Subclass:
89
Includes devices for maintaining parts in position of
application or release.
SEE OR SEARCH CLASS:
92, Expansible Chamber Devices, 24 for locking means for
retaining an expansible chamber device in the operative
position.
188, Brakes, subclass 265.
Subclass:
90
Valves so piped that the valve can be opened without
uncoupling.
Subclass:
112
This subclass is indented under subclass 121. Apparatus
wherein the braking action is regulated at least in part by
means responsive to a force or combination of forces
producing or tending to produce a twisting or rotating motion
on a braked rotating member.
SEE OR SEARCH CLASS:
188, Brakes, particularly subclass 181 for a vehicle torque
responsive regulator.
192, Clutches and Power-Stop Control, subclass .034 for
automatic interrelated power delivery controls using torque
only.
Subclass:
113.1
Having a valve system responsive to a wheel lock signal:
This subclass is indented under subclass 121. Structure
wherein there is provided a fluid pressure regulator which
includes at least in part a fluid passage opening or closing
structure responsive to a speed deceleration (e.g., actuating
a brake pedal).
Subclass:
113.2
With traction control:
This subclass is indented under subclass 113.1. Structure
wherein the system is provided with means to prevent
acceleration or drive slip.
Subclass:
113.3
Including booster:
This subclass is indented under subclass 113.2. Structure
wherein the acceleration or drive slip prevention also
includes a power assist device associated with a master
cylinder for controlling the release and reapplication of
brake pressure through an interaction with the power assist
device.
Subclass:
113.4
Including a stroke sensor:
This subclass is indented under subclass 113.1. Structure
wherein a movement in a fluid pressure regulator element
(e.g., a piston, brake pedal) is measured and a corresponding
signal is utilized in an anti-lock control.
Subclass:
113.5
With system apportioning control:
This subclass is indented under subclass 113.1. Structure in
which the fluid in the system is monitored and distributed to
correct an imbalance.
Subclass:
114.1
Including hydraulic power booster:
This subclass is indented under subclass 113.1. Structure
wherein the fluid pressure regulator cooperates with a power
assist device associated with a master cylinder for
controlling the release and reapplication of brake pressure
through an interaction with the power assist device.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 545 for a pulsator having
electrically or magnetically operated structure, subclass 561
for a pulsator having a pressure balancing free piston or a
diaphragm between parallel pulsators, subclass 581 for plural
structurally related master pistons, cylinders or pulsator
circuits, and subclass 582 for a pulsator having a safety
standby structure becoming operative due to the malfunction
of a power booster system.
91, Motors: Expansible Chamber Type, 391 for booster
arrangement with alternative means of actuation upon failure
of the primary means of actuation.
Subclass:
114.2
Parallel boosters:
This subclass is indented under subclass 114.1. Structure
wherein power assist devices are provided for each wheel or
each set of wheels.
Subclass:
114.3
Including pneumatic power booster:
This subclass is indented under subclass 113.1. Structure
wherein the fluid pressure regulator cooperates with a power
assist device of the compressed air type that is associated
with a master cylinder for controlling the release and
reapplication of brake pressure through an interaction with
the power assist device.
Subclass:
115.1
System controlled by expansible chamber type modulator:
This subclass is indented under subclass 113.1. Structure
wherein the fluid pressure regulator includes a variable
volume reactive device (e.g., piston and cylinder, bellows
type) having a motive fluid valve to regulate the pressure of
the braking fluid.
SEE OR SEARCH CLASS:
91, Motors: Expansible Chamber Type, subclass 439 for a
motor having opposed working chambers and a by-pass
therebetween independently controlled by valve means.
137, Fluid Handling, subclass 625.27 for a reciprocating
supply and exhaust multi-way valve unit of the plural disc or
plug type and subclass 625.25 for a motor operated supply and
exhaust multi-way valve unit.
251, Valves and Valve Actuation, subclass 25 for a fluid
actuated or retarded pilot or servo type motor and subclass
61.3 for a valve between a coaxial spring biasing means and a
fluid actuated flexible wall valve actuator.
Subclass:
115.2
Having electric control:
This subclass is indented under subclass 115.1. Apparatus
wherein the motive fluid valve is governed by a component
operated by electricity.
Subclass:
115.3
Having vacuum motor control:
This subclass is indented under subclass 115.1. Apparatus
wherein the motive fluid valve is governed by a negative
pressure, energy converting component.
Subclass:
115.4
Having pump pressure control:
This subclass is indented under subclass 115.1. Apparatus
wherein the motive fluid valve is governed by a force
generated by a fluid pressurizing means.
Subclass:
115.5
Pump pressure operates fluid motor:
This subclass is indented under subclass 115.4. Apparatus
wherein the fluid pressurizing means force drives an energy
converting device of the liquid or gaseous type.
Subclass:
115.6
Including flywheel control (e.g., motorcycle type):
This subclass is indented under subclass 115.1. Apparatus
wherein the motive fluid valve is governed by a device which
stores kinetic energy via mechanical inertia or momentum.
SEE OR SEARCH CLASS:
188, Brakes, 181 for a speed responsive regulator located on
a vehicle.
Subclass:
116.1
Including pump with system solenoid valve:
This subclass is indented under subclass 113.1. Apparatus
wherein the fluid pressure regulator comprises an additional
fluid circuit including fluid pressurizing means (e.g., pump)
and at least one fluid passage opening and closing structure
which responds to an electromagnetic force for modifying the
pressure of the braking fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for a fluid distribution system combined with a pump.
Subclass:
116.2
Having pressure line isolated from master cylinder line:
This subclass is indented under subclass 116.1. Apparatus in
which the fluid pressurizing means fluid source is
independent of the fluid source for a mutually reactive
expansible chambers device that operates the brake system.
Subclass:
116.3
Vehicle wheel operated pump:
This subclass is indented under subclass 116.1. Structure in
which the fluid pressurizing means is driven by rotation of
an automobile or truck drive axle, hub, rim, and tire.
Subclass:
116.4
System pump structure detail:
This subclass is indented under subclass 116.1. Apparatus
wherein the specific structure of the fluid pressurizing
means, e.g., chamber, piston structure, cylinder structure,
housing, intake (section), or output (cam, push rod) effects
the system.
SEE OR SEARCH CLASS:
415, Rotary Kinetic Fluid Motors or Pumps, appropriate
subclasses for details to a rotary kinetic pump.
416, Fluid Reaction Surfaces (i.e., Impellers), appropriate
subclasses for details to an impeller structure.
417, Pumps, appropriate subclasses for details to pump
structure.
Subclass:
117.1
Spool valve:
This subclass is indented under subclass 113.1. Apparatus
wherein the fluid pressure regulator is a sliding rod with a
series of fixed pistons that open or close fluid paths.
Subclass:
118.1
Pneumatic (relay or motorman) type:
This subclass is indented under subclass 113.1. Apparatus
wherein the fluid pressure regulator includes valve means for
controlling braking pressure to admit the necessary amount of
air pressure to the brakes of a vehicle or a railroad
vehicle.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40 for a valve actuated in response to a change in fluid
pressure to connect a source of fluid pressure to a motor.
50 for a motorman valve adapted to connect a source of fluid
supply to a motor.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclass 627.5 for systems including
sequentially closing and opening alternately seating flow
controllers.
Subclass:
119.1
System controlled by solenoid valve:
This subclass is indented under subclass 113.1. Apparatus
wherein the fluid pressure regulator includes at least one
fluid passage opening and closing structure which responds to
an electromagnetic force.
SEE OR SEARCH CLASS:
251, Valves and Valve Actuation, 30.01 for an
electromagnetically actuated pilot or auxiliary valve for
controlling a main valve, subclasses 129.01+ for an
electrical actuator.
Subclass:
119.2
System solenoid valve detail:
This subclass is indented under subclass 119.1. Apparatus in
which the specific structure of the electromagnetically
operated fluid pressure regulator, e.g., number of paths or
passageways, coil, electrical contacts, armature effects the
system.
Subclass:
119.3
Housing for plural solenoids:
This subclass is indented under subclass 119.1. System
solenoid valve in which a single container holds at least two
electromagnetic actuators.
Subclass:
121
Speed-controlled:
This subclass is indented under the class definition.
Subject matter wherein the braking fluid and therefore the
braking action is regulated by velocity.
(1) Note. A speed condition can be, for example, a velocity
signal from a single wheel or plural wheels, or a velocity
signal from a vehicle body.
(2) Note. Included in this subclass are the following: a
positive rate-of-change of velocity (acceleration) from a
wheel or plural wheels; a negative rate-of-change of velocity
(deceleration) from a wheel or plural wheels; an acceleration
from a vehicle body; or a deceleration from a vehicle body.
SEE OR SEARCH CLASS:
73, Measuring and Testing, 488 for measuring and testing
speed or acceleration, subclass 495 for speed or acceleration
diverse condition indicating, and subclass 509, for speed or
acceleration with response to a nonspeed condition.
116, Signals and Indicators, subclass 57 for devices to
indicate when a predetermined speed is reached.
188, Brakes, 180 for the regulation of vehicle brakes
(nonfluid pressure) in response to speed changes.
192, Clutches and Power-Stop Control, subclass 103 for
interrelated power delivery speed automatic control.
246, Railway Switches and Signals, subclass 182 for speed
control systems, and especially for automatic vehicle-carried
braking and speed comparison circuits respectively.
307, Electrical Transmission or Interconnection Systems,
subclass 10.1 for automobile mounted systems.
340, Communications: Electrical, subclass 441 for alarms or
indicators which respond to vehicle speed and may also
respond to variations in the pressure within a hydraulic
brake system.
361, Electricity: Electrical Systems and Devices, 236 for
electrical speed signal processing systems.
477, Interrelated Power Delivery Controls, Including Engine
Control, subclass 40 for using an engine transmission
control with brake control to slow a vehicle and subclasses
182+ for an engine brake control to slow a vehicle.
701, Data Processing: Vehicles, Navigation, and Relative
Location, subclass 70 for indication or control of braking,
acceleration, or deceleration; subclasses 71+ and 82+ for
processing or calculating a parameter used to determine
antiskid, antilock, or antispin.
Subclass:
122
With failure responsive means:
This subclass is indented under subclass 121. Speed control
provided with means for detecting faulty operation of a speed
control regulator and means for overriding a speed condition
regulator.
(1) Note. This subclass includes systems which cycle the
speed responsive control means in response to a simulated
speed condition to thereby check for the proper operation of
the speed responsive means and also includes means for
monitoring various components of a speed responsive control
means to detect any failure thereof.
SEE OR SEARCH CLASS:
340, Communications: Electrical, 453 for communication
automatically responsive to a brake condition, and subclass
515 for testing of an automatically responsive system by
simulation of condition.
Subclass:
122.01
Traction failure:
This subclass is indented under subclass 122. Speed control
with failure response in which the response is to a tire-road
contact area less than needed for efficient forward motion.
Subclass:
122.02
Antilock failure with warning:
This subclass is indented under subclass 122. Speed control
with failure response in which wheel slip control faulty
operation is indicated to a vehicle driver.
Subclass:
122.03
Failure related to brake condition (e.g., wear, sensor or
switch operation) with indicator:
This subclass is indented under subclass 122. Speed control
with failure response in which the faulty operation and the
state of the wheel rotation retarding or halting device is
detected and signaled to the vehicle operator.
Subclass:
122.04
Electric system failure(no warning):
This subclass is indented under subclass 122. Speed control
with failure response in which the faulty operation is due to
deenergization.
Subclass:
122.05
Electronic or electric component (e.g., speed detector,
failure sensing) with warning:
This subclass is indented under subclass 122.04. Speed
control with electric failure response in which the faulty
operation of an energized element; e.g., rate sensor, is
detected and indicated to a vehicle operator.
Subclass:
122.06
ABS failure detected via time period of sensed wheel lock or
wheel speed signal:
This subclass is indented under subclass 122. Speed control
with failure response in which the faulty operation occurs
during an interval when braking torque is maximum or ground
engaging member rate is high.
Subclass:
122.07
Time signal error (no warning):
This subclass is indented under subclass 122. Speed control
with failure response in which the faulty operation is
detected during an interval where monitoring circuits are no
longer consistent; e.g., the wheel speed is sampled and
compared to a previous speed (i.e., no deceleration) or a
predetermined limit.
Subclass:
122.08
Active circuit testing:
This subclass is indented under subclass 122. Speed control
with failure response in which, prior to the braking action,
a predetermined condition is used to check or analyze a skid
control system (sensors, regulator, electrical components,
etc.) to ensure proper operation.
Subclass:
122.09
Pressure failure:
This subclass is indented under subclass 122. Speed control
with failure response in which the faulty operation is due to
loss of a compressed fluid.
Subclass:
122.1
With warning:
This subclass is indented under subclass 122.09. Pressure
failure in which the faulty operation is indicated to a
vehicle operator.
Subclass:
122.11
Detected via stroke sensor:
This subclass is indented under subclass 122.09. Pressure
failure in which the faulty operation is during movement of
the master cylinder pistons.
Subclass:
122.12
Pump failure detection:
This subclass is indented under subclass 122.08. Pressure
failure in which the faulty operation of a compressed fluid
moving means is sensed.
Subclass:
122.13
Auxiliary pressure failure:
This subclass is indented under subclass 122.08. Pressure
failure in which the faulty operation of a backup system,
used in case of a failure or malfunction of a main hydraulic
pressure system, is sensed.
Subclass:
122.14
With warning:
This subclass is indented under subclass 122.13. Auxiliary
pressure failure in which the faulty operation is indicated
to a vehicle operator.
Subclass:
122.15
Pneumatic:
This subclass is indented under subclass 122.08. Pressure
failure in which the faulty operation is in a system using
gas; e.g., air.
Subclass:
123
For a tractor-trailer type vehicle:
This subclass is indented under subclass 121. Speed control
for a conveyance comprising towing means coupled to a freight
carrier by a towing link.
Subclass:
124
Electric brake:
This subclass is indented under subclass 123. Tractor
trailer speed control in which motion is retarded or halted
by an energized via application of a current and a voltage
system.
Subclass:
125
Automatic braking including speed governor or hydraulic
retarder:
This subclass is indented under subclass 121. Speed control
in which upon detection of excessive vehicle rate, the
braking action occurs without initiation of the operator.
Subclass:
126
Aircraft:
This subclass is indented under subclass 125. Automatic
braking in which the speed control is for a machine or
structure adapted to be completely or partially sustained by
the air.
Subclass:
127
Pneumatic:
This subclass is indented under subclass 121. Speed control
in a system using a gas; e.g., air:
Subclass:
128
For a railway vehicle (e.g., train):
This subclass is indented under subclass 127. Pneumatic
speed control for a conveyance which rides on a predetermined
path; e.g., track.
Subclass:
129
With speed governor (hydraulic or inertia):
This subclass is indented under subclass 128. Train speed
control in which the velocity of the conveyance is regulated
by a system using a pressurized liquid medium or by a system
responsive to a change of motion.
Subclass:
130
Compared to fixed reference:
This subclass is indented under subclass 129. Train speed
control with governor in which the velocity is contrasting an
actual parameter; e.g., speed, acceleration, with a
previously defined parameter.
Subclass:
131
Plural similar inputs:
This subclass is indented under subclass 128. Train speed
control in which at least two of the same condition; e.g.,
speeds of at least two wheels, determine the subsequent
braking action.
Subclass:
132
Speed responsive and other conditions (e.g., acceleration,
pressure, track hazard, friction):
This subclass is indented under subclass 128. Train speed
control in which the rate and an additional input determine
subsequent braking action.
Subclass:
133
Traction control:
This subclass is indented under subclass 128. Train speed
control in which the braking action is affected by wheel
skid.
Subclass:
134
Compared to fixed reference:
This subclass is indented under subclass 128. Train speed
control in which the velocity is contrasting an actual
parameter; e.g., speed, acceleration with a previously
defined parameter.
Subclass:
135
Automatic:
This subclass is indented under subclass 128. Train speed
control in which the braking action is applied without direct
action by the operator.
Subclass:
136
Pseudo-speed:
This subclass is indented under subclass 128. Train speed
control in which the braking action is controlled by a rate
determined from the difference between wheel and vehicle
speeds.
Subclass:
137
Motorcycle:
This subclass is indented under subclass 121. Speed control
for a two-wheeled motorized vehicle.
Subclass:
138
Speed, deceleration, or ABS indication:
This subclass is indented under subclass 121. Speed control
in which a rate of vehicle travel, decreasing rate per time,
or wheel slip is brought to the attention of a vehicle
operator via a lamp, recorder, etc.
Subclass:
139
And traction control:
This subclass is indented under subclass 121. Speed control
in which the braking action is regulated by a reaction to
skidding.
Subclass:
140
With yaw control:
This subclass is indented under subclass 139. Speed and
traction control including a vehicle side-to-side movement or
angular motion about a vehicle vertical axis regulator.
Subclass:
141
With engine torque power take-off (PTO) control:
This subclass is indented under subclass 139. Speed and
traction control including a vehicle motor force producing
rotation regulator.
Subclass:
142
Motor control:
This subclass is indented under subclass 139. Speed and
traction control including a vehicle engine force to provide
braking action.
Subclass:
143
With four wheel drive or all wheel drive:
This subclass is indented under subclass 139. Speed and
traction control in which the braking action is designed for
a vehicle with a differential for each axle.
Subclass:
144
Intersecting traction and skid occurrence:
This subclass is indented under subclass 139. Speed and
traction control in which a control unit compensates for a
succession of a slip and spin condition.
Subclass:
145
Odd condition (e.g., fuel supply cut-off, modulating valve):
This subclass is indented under subclass 139. Speed and
traction control in which the braking action is controlled by
an additional parameter different from the usual condition of
acceleration or pressure.
Subclass:
146
With yaw control:
This subclass is indented under subclass 121. Speed control
in which the braking action is controlled by a vehicle side
to side movement or angular motion about a vehicle vertical
axis.
(1) Note. Yaw control in which the braking action is
controlled by conditions detected related to; e.g., geometry,
force, friction is classified here.
Subclass:
147
From speed sensors:
This subclass is indented under subclass 146. Yaw control in
which the braking action is controlled by conditions detected
related to rate.
Subclass:
148
From split coefficient of friction (mu):
This subclass is indented under subclass 146. Yaw control in
which the braking action is controlled by detection of a low
to high road-tire resistance.
Subclass:
149
Split coefficient of friction (mu):
This subclass is indented under subclass 121. Speed control
with failure response in which the braking action is
controlled by detection of a low to high road-tire resistance
based on wheel deceleration versus a reference deceleration.
Subclass:
150
Specific mu determination:
This subclass is indented under subclass 121. Speed control
in which the braking action is determined from the tire to
road contact force.
Subclass:
151
Traction-motor vehicle:
This subclass is indented under subclass 121. Speed control
in which an electric to mechanical energy converter is
conditioned during the braking action to operate as a
generator thereby permitting recapture of the kinetic energy
during the braking action.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149 for regenerative brakes.
Subclass:
152
Regenerative brakes:
This subclass is indented under subclass 121. Speed control
in which a hydraulic motor normally driving the vehicle is
conditioned during the braking action to operate as a
generator thereby permitting recapture of the vehicle's
kinetic energy during the braking action.
SEE OR SEARCH THIS CLASS, SUBCLASS:
148 for traction-motor vehicle brakes.
Subclass:
153
Lead signal control for antiskid:
This subclass is indented under subclass 121. Speed control
in which a network responsive to a time derivative pulse of
the braking action reacts to alter steering.
Subclass:
154
Multiple control signal with multiple threshold:
This subclass is indented under subclass 121. Speed control
in which the braking action is determined from more than one
input; e.g., large spin-up rate, a small wheel speed versus
car deviation, wheel speed, vehicle speed, slip,
deceleration, coefficient of friction, having more than one
limit condition, reference, or value.
Subclass:
155
Braking pressure demand or braking force desire:
This subclass is indented under subclass 121. Speed control
in which the braking action is (a) controlled by a response
of an operator; i.e., force applied to the brake pedal or (b)
is equalized throughout a system; e.g., front or rear brakes
adjusted to supply more braking depending on sensed
parameters such as wheel speed.
Subclass:
156
Pulse frequency or time period controlling pressure rebuild:
This subclass is indented under subclass 121. Speed control
in which after the braking action is applied, a burst of
electrical energy or an interval determines a force for
braking being restored.
Subclass:
157
Pressure release control:
This subclass is indented under subclass 121. Speed control
wherein an output signal from a deceleration detecting means
operates to reduce a braking force.
Subclass:
158
Pressure reapply control:
This subclass is indented under subclass 121. Speed control
in which conditions; e.g., wheel velocity, vehicle
acceleration, coefficient of friction, monitored during the
braking action are evaluated to determine either control of
the braking fluid force.
Subclass:
159
Wheel pressure delay compared to reference:
This subclass is indented under subclass 121. Speed control
in which release or reapplication of braking force is held
back relative to a determined release or reapplication
control signal.
Subclass:
160
Pressure or specific condition (e.g., deceleration)
determines wheel speed instead of direct speed sensor:
This subclass is indented under subclass 121. Speed control
in which the rate of a road engaging member of a typical
vehicle is found by changes in, for example, a compressed
fluid system, rate per time change, vehicle rate,
displacement, coefficient of friction, to decide braking
action.
Subclass:
161
Current or voltage ramp proportional to vehicle speed:
This subclass is indented under subclass 121. Speed control
in which the braking action is dependent upon stepping the
amperage or electric potential to rotate a brake motor to
assure a smooth increase in force.
Subclass:
162
Current control of linear piston drive motor:
This subclass is indented under subclass 121. Speed control
in which the braking action is dependent upon an amperage put
out by an electrical power generating device.
Subclass:
163
Slip ratio:
This subclass is indented under subclass 121. Speed control
in which the braking action is subsequently determined from a
dimensionless number using the equation, vehicle speed minus
wheel speed then divided by vehicle speed (at the time of
brake impartation).
Subclass:
164
Slip time versus nonslip time:
This subclass is indented under subclass 121. Speed control
in which the braking action is based on a relationship
between a wheel spin (slip ratio) time versus a time when no
wheel spin occurs.
Subclass:
165
Variable target slip values:
This subclass is indented under subclass 121. Speed control
in which the braking action is affected by comparing a wheel
spin or slippage threshold with detection of an actual wheel
spin and altering the threshold for the spin detected.
Subclass:
166
Wheel speed sensor and braking pressure sensor:
This subclass is indented under subclass 121. Speed control
in which both the detection of rate of a road engaging member
of a typical vehicle and detection of a compressed fluid
decides the braking action force.
Subclass:
167
Brake force or pressure determined from speed sensors:
This subclass is indented under subclass 121. Speed control
in which the compressed braking fluid is regulated by a
measurement of a rate of the wheel or the vehicle.
Subclass:
168
Wheel generated pulse signal control (speed sensor):
This subclass is indented under subclass 121. Speed control
in which detection of a rotating road engaging member by a
magnetic or optical pick-up element, or a tachometer-type
device, makes an electrical wave that is processed to
determine braking action.
SEE OR SEARCH CLASS:
73, Measuring and Testing, 488 for speed sensor
construction.
Subclass:
169
Left or right speed comparison:
This subclass is indented under subclass 121. Speed control
in which the braking action is determined by contrasting a
driver's side wheel rate to a passenger's side wheel rate.
Subclass:
170
Select high wheel speed versus select low:
This subclass is indented under subclass 121. Speed control
in which the rate of rotation is compared and the braking
action determined from a maximum or minimum rate.
Subclass:
171
Wheel speed versus pseudo vehicle speed (e.g., from
deceleration):
This subclass is indented under subclass 121. Speed control
in which the braking action is influenced by a road engaging
member rate exceeding a reference value of a conveyance
rate.
Subclass:
172
By direct feedback or instant wheel control:
This subclass is indented under subclass 171. Speed control
in which the braking action is affected by a road engaging
member rate exceeding a conveyance rate found by inputs from
the road engaging member rate.
Subclass:
173
By comparison of plural wheel speeds:
This subclass is indented under subclass 171. Speed control
in which the braking action is altered by a fastest rate of a
road engaging member exceeding a reference value of a
conveyance rate found by a rate of road engaging members
slower than the fastest rate.
Subclass:
174
Previously stored wheel speed information:
This subclass is indented under subclass 121. Speed control
in which the braking action is controlled by comparing a
value of the road engaging member velocity held in a memory
to the instantaneous velocity.
Subclass:
175
Incipient or imminent skid measured:
This subclass is indented under subclass 121. Speed control
in which the braking action is regulated by a condition of
apparent or impending loss of traction of one wheel; e.g.,
front wheel, by rotating at a higher circumferential speed
than another wheel on the same axle.
Subclass:
176
Antilock control disabled or altered for acceleration or
speed ranges:
This subclass is indented under subclass 121. Speed control
in which a wheel slip correction system is temporarily
deactivated or changed for a predetermined rate per time or
rate limits.
Subclass:
177
Sensing jerk, acceleration, or deceleration:
This subclass is indented under subclass 121. Speed control
in which the braking action is determined from a first
derivative of speed or by a system responsive to a change of
rate per time motion.
Subclass:
178
Wheel deceleration to find velocity error:
This subclass is indented under subclass 177. Sensing
acceleration in which a road engaging member rate per time
circuit produces a reference signal which is a function of a
difference or inaccuracy between a road engaging member rate
and a rate which is a function of the signal.
Subclass:
179
Rotary and linear inertia:
This subclass is indented under subclass 177. Sensing
acceleration in which an eccentric mass both rotates about an
axis and reciprocates along the same axis.
Subclass:
180
Rotary inertia:
This subclass is indented under subclass 177. Sensing
acceleration in which an eccentric mass rotates about an
axis.
Subclass:
181
Linear inertia or accelerometer (includes pendulum type):
This subclass is indented under subclass 177. Sensing
acceleration in which an eccentric mass reciprocates along an
axis.
Subclass:
182
Accelerometer versus wheel rotation sensor:
This subclass is indented under subclass 177. Sensing
acceleration in which a road engaging member rate of turning
is measured and compared to a rate per time.
Subclass:
183
Specific acceleration or deceleration determined
electronically:
This subclass is indented under subclass 177. Sensing
acceleration wherein rate per time is found by a circuit
which then controls braking action.
Subclass:
184
Acceleration-deceleration versus timing:
This subclass is indented under subclass 177. Sensing
acceleration in which the rate per time parameter compared to
a specific interval controls braking action.
Subclass:
185
Sensing deceleration then acceleration:
This subclass is indented under subclass 177. Sensing
acceleration wherein the braking fluid is regulated to allow
for a brake release in response to negative rate of change or
velocity followed by a brake reapplication in accordance with
a positive rate of change of velocity.
Subclass:
186
Front-rear axle apportioning or speed difference:
This subclass is indented under subclass 121. Speed control
in which the braking fluid of the steerable wheels and the
back wheels is distributed according to the rotational rate.
Subclass:
187
Diagonal wheels apportioning arrangement:
This subclass is indented under subclass 121. Speed control
in which the braking fluid for a right front wheel is
operatively connected to a left rear wheel, etc.
Subclass:
188
All wheel apportioning arrangement (e.g., cross coupling):
This subclass is indented under subclass 121. Speed control
in which the braking fluid for each road engaging member is
operatively connected.
Subclass:
189
Independent control for each wheel:
This subclass is indented under subclass 121. Speed control
in which a separate and distinct braking action to every road
engaging member of a typical vehicle is regulated.
Subclass:
190
Four-wheel drive or all wheel drive:
This subclass is indented under subclass 121. Speed control
wherein the braking action is designed for a vehicle with a
differential for each axle.
Subclass:
191
Odd condition or device detection (e.g., fluid or brake
temperature, hill holder, anti-squeal controller, acoustic
emission):
This subclass is indented under subclass 121. Speed control
in which the braking action is controlled by an additional
parameter different from the usual condition of acceleration
or pressure.
Subclass:
192
Vehicle inclination:
This subclass is indented under subclass 191. Odd condition
in which the braking action is influenced by a slope of an
automobile, truck, etc.
Subclass:
193
With sonar or radar type sensor:
This subclass is indented under subclass 191. Odd condition
in which the rate (or an obstruction) is found by a detector
that operates in the (a) sonic or supersonic range, or (b)
ultrahigh frequency or microwave part of the radio spectrum
range.
Subclass:
194
Hop or bounce (from vibration or oscillation) signal:
This subclass is indented under subclass 191. Odd condition
in which high or low amplitude pulses, produced by a wheel
going over an obstruction or falling into a hole, are
detected during braking action.
Subclass:
195
Spurious signal:
This subclass is indented under subclass 191. Odd condition
in which pulses outside a specific amplitude or frequency (or
both) are detected during braking action.
Subclass:
196
For rough road:
This subclass is indented under subclass 195. Spurious
signal in which the pulses are created by a driving surface
containing irregularities such as potholes, speed bumps,
etc.
Subclass:
197
With feeler wheel:
This subclass is indented under subclass 191. Odd condition
in which the braking action is determined from a road
engaging member independent from the vehicle road engaging
members.
Subclass:
198
Speed and vehicle load condition (e.g., cargo):
This subclass is indented under subclass 191. Odd condition
wherein the braking fluid is regulated by velocity and
additional weight due to freight, extra passengers, etc.
Subclass:
199
Electric control circuit detail:
This subclass is indented under subclass 121. Speed control
which specifies a component (e.g., resistor, capacitor,
diode) of a system that generates the signals for operation.
CROSS-REFERENCE ART COLLECTIONS
Subclass:
900
ABS throttle control:
This subclass is indented under the class definition.
Structure wherein the anti-lock brake system includes a flow
restriction of the brake fluid in the system.
Subclass:
901
ABS check valve detail:
This subclass is indented under the class definition.
Structure wherein the anti-lock brake system includes the
particular elements of a preset fluid regulating device which
restricts flow in one direction.
Information Products Division -- Contacts
Questions regarding this report should be directed to:
U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231
tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov
Last Modified: 6 October 2000