U.S. PATENT AND TRADEMARK OFFICE
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U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
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Class 122
LIQUID HEATERS AND VAPORIZERS
Class Definition:
This class relates to heating liquids, generating vapors from
liquids, treating the vapors generated for use, such as
superheating or cooling them, and conserving the heat
remaining in the liquid or vapor after a part of the heat
energy has been made use of for any purpose. To bring a
liquid heater into this class, the chamber, receptacle or
conduit in which the liquid is heated must be fluid tight.
This class includes combinations of steam superheaters,
feed-water heaters, steam separators, condensers, traps,
manhole-closures, safety devices, cleaners, and feeders with
a boiler when the structure of necessity must form a part of
the boiler structure combination, also parts of boilers
unless they are of general application.
This class includes water-cooled grates whether or not in
connection with a boiler for heating the boiler water. It
also includes the boiler and furnace in combination or the
boiler alone with the furnace alone.
The liquid containers classified in this class may be heated
by solid or fluid fuel burned in any type of furnace or
burner, by friction, or by chemical action other than
combustion, or by electricity. The heat may be applied
directly to the walls of the fluid containing chamber or
indirectly by the interposition of a fluid in a distinct and
separate chamber, which fluid being heated may impart its
heat to the fluid to be finally heated. When the fluid is
heated by the interposition of another fluid the heat
generator must be a part of the unitary structure of the
fluid heater, with one exception--to wit: devices for
generating a vapor having a vapor separator within the fluid
chamber may be heated indirectly by a fluid, the furnace for
heating which does not form part of the unitary structure.
The fluid may be heated also by a heat radiating body in
either a liquid, or solid state, which body may be either on
the inside or on the outside of the fluid chamber; but if
said heating body be inside the fluid chamber its nature must
be such that it will not mix with the fluid to be heated.
LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
The distinction between water heaters in Classes 122 and 126
is this: The water heaters in Class 122 have a closed water
containing chamber or receptacle for holding the water while
it is heated or have one or more closed conduits through
which the water flows while being heated; but the water
heaters in class 126 are of the open type. In Class 122 are
classified mechanism for regulating both the inflow of water
to the boiler and the burning of the fuel in all cases when
steam is generated and also in all cases when water is
heated, excepting in devices for heating water where the
opening of a valve to permit water to flow through the heater
at the same time increases the heat of the heat generator,
such devices being classified in Class 126, subclasses 351;
but this subclass relates only to the controlling device for
the water and fuel. The structure of the water heater or
boiler together with such a controlling mechanism are
classified in Class 122.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, subclass
104.03 for pipe and tube cleaners generally 314, 316.1+ and
406+ for pipe and tube cleaners and boiler tube blowers using
air or steam blast and/or suction.
29, Metal Working, subclass 890.051 for a method of making a
boiler or subclass 890.07 for a method of making a condenser,
evaporator, or vaporizer.
60, Power Plants, 641.1 for power plants utilizing solar
water heaters and steam generators and subclasses 39.05 and
39.53+ for processes and apparatus for addition of steam
and/or water with products of combustion.
68, Textiles: Fluid Treating Apparatus, having significant
structure for fluid treatment of a textile, subclass 15 for
a textile fluid treating machine combined with a tank heater,
or subclass 222 for an implement to apply steam to a
textile.
73, Measuring and Testing, 215 for weir maters combined with
feed water heater structures.
99, Foods and Beverages: Apparatus, subclass 276, 277, and
359+ for beverages and food cookers using liquid heaters
pertinent to this class; and subclasses 468+ for treatment of
dairy food which includes milk treating apparatus using
liquid heaters.
116, Signals and Indicators, for signals.
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 5 for a cooking and heating
stove having a water heater or steam generator; subclasses
20-20.2 for a cooking oven heated by steam or hot water;
subclass 31 for a cooking stove having a water heater in a
flue extension; subclasses 34 and 35 for a cooking stove
having a water back; subclass 101 for a hot air furnace
combined with a boiler; subclasses 344-363.1 for a liquid
heater that may include a kettle, a steam generator, stove
pipe for use with a stove, and a domestic water heater or
boiler (e.g., kitchen boiler, range boiler, etc.) for use
with a stove or furnace; subclasses 513 and 514 for a
fireplace with a liquid heater; subclasses 561-568 for a
solar heat collector for a pond or pool; subclasses 569-713
for a solar heat collector that may include a fluid medium;
or subclass 714 for a process of heating by using solar
heat.
137, Fluid Handling, subclass 11 for processes for
regulating the boiler water level, subclass 94 for the
control of the fuel in response to boiler or water heater
condition subclasses 156+ for gas pressure discharge of
liquid as to a boiler, subclasses 171+ for steam traps,
subclasses 386+ for level responsive valves, and subclasses
557 and 558 for pressure and level responsive signals and
indicators.
138, Pipes and Tubular Conduits, appropriate subclasses for
the wall structure of a boiler tube or flue; 89 for plugs
for pipes; and subclasses 98+ for patches for pipes.
165, Heat Exchange, appropriate subclass, for a heat
exchanger, per se.
202, Distillation: Apparatus, 152 for liquid volatilization
for the purpose of recovering material from the vapor
produced by condensation or absorption.
204, Chemistry: Electrical and Wave Energy, subclasses
196.01-196.38 for electrolytic protection apparatus (e.g.,
to prevent corrosion, scale formation, or other objectionable
action upon liquid heaters or vaporizers, etc.).
205, Electrolysis: Processes, Compositions Used Therein, and
Methods of Preparing the Compositions, subclasses 724-740
for processes of electrolytic protection of metal objects
(e.g., to prevent corrosion, scale formation, or other
objectionable action upon liquid heaters or vaporizers,
etc.).
210, Liquid Purification or Separation, 175 for a heater or
heat exchanger combined with liquid purification means.
219, Electric Heating, 281 for water heaters and steam
generators particularly adapted to be heated by an electric
heater.
220, Receptacles, appropriate subclasses, for wall structures
of containers of more general utility and for safety devices
and for manhole covers.
237, Heating Systems, for an apparatus or process of heating
an enclosure, subclass 7 for a combined radiator and boiler
having automatic control, or subclasses 16-18 for a combined
boiler and radiator.
264, Plastic and Nonmetallic Article Shaping or Treating:
Processes, subclass 30 for furnace lining formation or
repair and see the notes thereto.
411, Expanded, Threaded, Driven, Headed, Tool-Deformed, or
Locked-Threaded Fastener, subclass 367 for a threaded
fastener and nut having stay bolt spacer sleeve; subclass 370
for a threaded fastener and nut having a stay bolt bearing
washer; subclasses 379+ for a threaded stay bolt, per se; and
subclass 505 for an unthreaded stay bolt, per se.
417, Pumps, 36 for liquid level control of a pump drive
motor, subclasses 108+ for aerated column type pumps wherein
is elevated by alternate globules of water and steam and
subclasses 118+ for pumping of liquid by supplying or
exhausting of gaseous motive fluid to or from a pump
chamber.
451, Abrading, for structural features of a cleaner for a
tube or flue.
510, Cleaning Compositions for Solid Surfaces, Auxiliary
Compositions Therefor, or Processes of Preparing the
Compositions, 247 for compositions for descaling steam
boilers or other water containers.
GLOSSARY:
BOILER
Used as a generic term for a liquid heater. The nature of
the liquid heated is immaterial. Whether the liquid heated
is conducted from the boiler as liquid or vapor depends upon
the amount supplied and the degree of heat attained, and for
this reason generally no distinction has been noted in the
classification, similar structures being classified together
regardless of the ultimate effect. In the type of boilers
known as "flashers" this distinction is of importance and
provision has been made therefor.
FIRE TUBES
Include both small and large tubes through which the products
of combustion pass unless the term "flue" is used with them,
in which case "fire tubes" would refer to the small tubes,
and "flues" to the large tubes for the products of
combustion.
STEAM
To be taken in a generic sense as meaning vapor.
STEAM TUBES
Designate vapor tubes whether the vapor therein be formed
from water or any other liquid.
WATER TUBES
Designate tubes, both large and small, through which liquid
or vapor passes.
WATER
To be taken in a generic sense as meaning liquid.
SUBCLASSES
Subclass:
1
This subclass is indented under the class definition.
Combinations of elements and devices each performing
different functions for the conservation of the heat
generated in the furnace, the ultimate object of which is the
production of steam or the heating of water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21 for "alkali" steam generators.
448.1 449, 450, and 452, for regulating means.
SEE OR SEARCH CLASS:
60, Power Plants, generally for devices peculiar to that
class.
91, Motors: Expansible Chamber Type, for plants involving
the steam engine structure.
123, Internal-Combustion Engines, 2 for combinations of
internal combustion motors and other engines and steam
boilers.
237, Heating Systems, subclass 12.1 and 13 for vehicle plant
and heating systems.
418, Rotary Expansible Chamber Devices, for plants involving
rotary expansible chamber structure.
Subclass:
2
This subclass is indented under subclass 1. Plants for the
destruction of garbage relating either to the arrangement of
the boiler or the boiler structure adapted for this special
purpose.
SEE OR SEARCH THIS CLASS, SUBCLASS:
232 and 376, for water grate structure adapted to burn
garbage or other waste material.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 234, for garbage plants with a
conventional arrangement of a boiler therewith.
Subclass:
3
This subclass is indented under subclass 1. Boiler plants
specially adapted for motor vehicles.
SEE OR SEARCH THIS CLASS, SUBCLASS:
446 448.1, 449, and 452, for analogous structure.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 668 for a steam power system
physically related to a vehicle.
180, Motor Vehicles, 36 for a motor vehicle of the steam
traction engine type; subclasses 303+ for a motor vehicle
having a traction motor of the kind which is driven by
expansible gas from a source external of the motor and
wherein the gas is produced by treating a volatile fluid
(e.g., the gas is steam); and subclass 310 for a motor
vehicle having means to generate steam for a propulsion
purpose.
Subclass:
4
This subclass is indented under the class definition.
Boilers and parts thereof not otherwise classifiable.
Subclass:
5
This subclass is indented under the class definition.
Subject matter relating to combinations of a gas producing
furnace and boiler when the structure of the boiler is
intimately associated with the producer, so as to form a
unitary structure, the gas from the producer being burned to
heat the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6 for boilers heated by gas passing through a boiler from a
gas producer, the heat of the hot gas being used for heating
the boiler.
SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, for gas making plants
including a boiler.
110, Furnaces, subclass 229, for gas producer furnaces and
see the notes therewith.
Subclass:
5.51
AIR-INJECTED:
This subclass is indented under the class definition.
Devices for vaporizing a liquid, with means for mingling air
therewith in the vaporizer.
Subclass:
5.52
Combustion gas and vapor contact:
This subclass is indented under subclass 5.51. Devices
wherein the vapor is combined with the byproducts of burning
fuels.
Subclass:
6
This subclass is indented under the class definition.
Subject matter relating to boilers, water heaters, or cooling
devices for furnace walls having a closed chamber or conduit
combined with a conventional type of furnace employed in a
special art.
(1) Note. If the cooling device is not a closed chamber or
conduit, it will be classified in the type of furnace of the
special art. Class 122 includes such devices known as bosh
plates, water cooled walls and roofs, linings, and water
cooled tuyeres when the cooling device is a closed chamber or
conduit and there is otherwise no novelty in the invention.
SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, 63 and 67, for gas
producers using similar structure.
266, Metallurgical Apparatus, subclass 190 and 241 for
cooling features in devices of that class.
431, Combustion, subclass 160 for a furnace type combustion
chamber having means directing nonliquid cooling medium
across elements of a device dispersing fuel into a furnace.
432, Heating, 233 for a residual material heating apparatus
element having protective cooling structure.
Subclass:
6.5
This subclass is indented under subclass 6. Subject matter
comprising water circulation devices applied to the gas or
air ports of a furnace.
SEE OR SEARCH CLASS:
431, Combustion, subclass 160 for a fuel disperser installed
in a combustion chamber cooled by a gas additional to the
combustion materials.
432, Heating, subclass 173 for a specific furnace having a
protective cooling means for combustion material feed
structure.
Subclass:
6.6
This subclass is indented under subclass 6. Subject matter
comprising conduits for feeding air to furnaces and provided
with a closed water-circulation.
SEE OR SEARCH CLASS:
110, Furnaces, 182.5 for tuyeres of general application and
for other water circulation means therefor.
266, Metallurgical Apparatus, 265 and especially 270 for
tuyeres used in metallurgical apparatus which may include a
liquid cooled tuyere element where the tuyere element is
combined with additional structure, as for example, an
external gas supply pipe, means for feeding diverse
materials, flow control valves or a tuyere cooler, Further,
see subclasses 186+ and 218+ for tuyeres combined with the
treating vessel.
Subclass:
6.7
This subclass is indented under subclass 6.6. Devices with
water circulation, of a type used in a forge and in which the
direction of the air blast is usually vertical.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 182.6 for tuyeres in forge
furnaces.
Subclass:
7
This subclass is indented under subclass 6. Devices
comprising combinations of a conventional type of industrial
furnace and a boiler located so as to be heated by the waste
heat of the furnace.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 421 and 470, for analogous devices.
SEE OR SEARCH CLASS:
432, Heating, 90 for (1) a structure in which the waste heat
of a nominal boiler heats a material heating chamber of the
Class 432 type (2) a structure in which the waste heat of a
specific furnace heats a closed water chamber or conduit or
(3) for a residual combination of a liquid heater and a work
heater of the Class 432 type in which the heated liquid is
utilized in heating the work.
Subclass:
8
This subclass is indented under subclass 6. Industrial
boilers having a water jacket firebox.
Subclass:
9
This subclass is indented under subclass 8. Industrial
boilers including a firebox the walls of which are provided
with water containing tubes.
Subclass:
10
This subclass is indented under the class definition.
Boilers for generating steam for feeding a fluid fuel
burner.
SEE OR SEARCH CLASS:
431, Combustion, 207 for a burner assembly including as an
element a supply line in which burner feed; e.g., air, oil,
or fuel atomizing water; is heated.
Subclass:
11
This subclass is indented under the class definition.
Boilers in which a substantial part or the whole of the
fluid-containing chamber is designed to be
continuously-rotated while heating the water or generating
steam.
Subclass:
12
This subclass is indented under the class definition.
Boilers that are supported in bearings so that the whole
boiler or a substantial part thereof may be turned on an
axis, generally either vertical or horizontal, after its
connecting steam and water pipes have been uncoupled.
Subclass:
13.01
STAND BOILER (E.G., WATER HEATER, ETC.):
This subclass is indented under the class definition.
Subject matter comprising heating means applied directly or
indirectly to the wall of the fluid containing chamber, where
the fluid is water, to provide hot water for domestic or
household use (e.g., cooking, cleaning, washing, bathing,
space heating, etc.).
(1) Note. The stand boiler (e.g., water heater, etc.) may be
found in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) to provide hot water for domestic or household
use (e.g., cooking, cleaning, washing, bathing, space
heating, etc.).
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 for a subsidiary liquid heater consisting of a pipe,
coil, hollow plate, or cylinder in a firebox, combustion
chamber, or offtake flue of a furnace in a boiler to generate
steam or hot liquid for other than the boiler.
233 for a horizontal disposed tank combined with a wall of a
furnace.
234 for a vertically disposed tank combined with heating
means.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclasses 350.1-350.2 for a fluid fuel
burner other than a top-accessible liquid heating vessel.
220, Receptacles, subclass 567.3 for a stationary tank for a
hot water heater or boiler.
392, Electric Resistance Heating Devices, subclass 322 and
323 for an electrically conductive fluid (e.g., water, etc.)
forming part of the circuit that heats the fluid including a
reservoir or tank, or subclasses 449-464 for a line-connected
tank- or container-type liquid heater.
Subclass:
13.3
And delivery means to dispensing feature:
This subclass is indented under subclass 13.01. Subject
matter and means to convey the hot water from the stand
boiler to some end use such as a domestic fixture (e.g.,
faucet, shower, washing machine, dishwasher, etc.).
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 362.1 for a boiler receiving hot
liquid or steam from a stove or furnace (e.g., kitchen
boiler, range boiler, etc.) having liquid circulation means,
or subclass 365.1 for a liquid heater and stovepipe having
liquid circulation means.
237, Heating Systems, for an apparatus or process of heating
an enclosure, subclass 7 for a combined radiator and boiler
having automatic control or subclasses 16-18 for a combined
boiler and radiator.
Subclass:
14.1
And condition responsive feature:
This subclass is indented under subclass 13.01. Subject
matter and means to sense a state or change in the state of
the stand boiler or the water heated by the stand boiler to
effect a change in the operation of the stand boiler or the
heated water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
448.1-448.4, for automatic control of fluid fuel and feed
water to a boiler.
504-507, for a boiler safety device.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 351.1 for a fluid fuel burner
other than a top-accessible liquid heating vessel and a
condition responsive feature or subclass 374.1 for an
open-top liquid heating vessel that may include a lid and a
condition responsive feature.
340, Communications: Electrical, subclasses 500-693.12 for
an electrical automatic condition responsive indicating
system.
Subclass:
14.2
Controls burner:
This subclass is indented under subclass 14.1. Subject
matter wherein the condition responsive feature effects
change in the burner.
SEE OR SEARCH CLASS:
137, Fluid Handling, subclass 94 for a condition responsive
system where fuel is proportioned or correlated to some
boiler or water system condition.
Subclass:
14.21
By other than temperature of water:
This subclass is indented under subclass 14.2. Subject
matter wherein the condition responsive feature controls the
burner by other than responding to the condition of the water
having a degree of hotness or coldness measured on a definite
scale.
(1) Note. This may also include a temperature condition
responsive means for the liquid.
Subclass:
14.22
By temperature of water in water containing chamber or
external tank:
This subclass is indented under subclass 14.2. Subject
matter wherein the condition responsive feature controls the
burner by responding to the condition of the water having a
degree of hotness or coldness measured on a definite scale
stored in the water containing chamber or a closed receptacle
outside of and for storing water heated by the stand boiler.
SEE OR SEARCH CLASS:
374, Thermal Measuring and Testing, subclasses 100-207 for
a temperature measuring device (e.g., thermometer, etc.).
Subclass:
14.3
Having water flow control feature:
This subclass is indented under subclass 14.1. Subject
matter wherein the condition responsive feature includes
means to effect direction of movement or quantity of the
water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
451.1 451.2, for a feed water heater having automatic control
of the feed water flow by thermally responsive means.
456 457, for a feed water heater having a tank or receptacle
that includes automatic control of inlet and outlet valves
allowing the feed water to flow by gravity to the boiler.
SEE OR SEARCH CLASS:
137, Fluid Handling, a residual class for process or
apparatus, subclasses 87.01-87.06 for a condition
responsive system where fluid flow in a flow line is
proportioned or correlated to some condition of a fluid
flowing in another fluid flow line or subclasses 455-543.23
for a valve controlling a flow line responsive to a change in
the condition of the fluid.
417, Pumps, subclasses 279-311 for a pump having condition
responsive control of the pumped fluid.
Subclass:
14.31
Using valve actuated by flow or pressure (e.g., check valve,
etc.):
This subclass is indented under subclass 14.3. Subject
matter wherein the water flow control feature is an element
having a definite predetermined motion to open, close, or
partially obstruct a port or passageway and is moved into
action by the movement, quantity, or force per unit area of
the liquid.
SEE OR SEARCH CLASS:
251, Valves and Valve Actuation, subclasses 12-63.6 for a
valve actuated or retarded by fluid acting on the actuating
means.
Subclass:
15.1
Heated by liquid or steam (e.g., indirect heating, etc.):
This subclass is indented under subclass 13.01. Subject
matter wherein the stand boiler uses a hot fluid that is
shapeless, virtually incompressible, has a definite volume
(e.g., water, etc.) or a vapor emitted from such a fluid to
transfer thermal energy to the water in the stand boiler.
(1) Note. This may include a burner for heating the liquid
or steam that transfers the thermal energy to the liquid in
the stand boiler.
(2) Note. The heating liquid or steam may have a pressure
higher than the liquid in the stand boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
32-34, for a liquid indirectly heated by a separate heating
fluid.
Subclass:
16.1
Solid fuel burner:
This subclass is indented under subclass 13.01. Subject
matter wherein the stand boiler is heated by the solid fuel
burner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22 for a residual solid or liquid fueled boiler.
211 for a solid or liquid fueled sectional boiler.
368-370, for a residual boiler having a water-jacketed
firebox.
SEE OR SEARCH CLASS:
110, Furnaces, a residual class for solid material combustion
apparatus or a method of operating solid material combustion
apparatus.
110, Furnaces, a residual class for solid material combustion
apparatus or a method of operating solid material combustion
apparatus.
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 367.1 and 368.1 for a liquid
heater having a solid fuel burner submerged underneath the
surface of the liquid.
Subclass:
17.1
Fluid fuel burner:
This subclass is indented under subclass 13.01. Stand
boiler wherein the stand boiler is heated by the fluid fuel
burner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 for a residual boiler heated by fluid fuel.
SEE OR SEARCH CLASS:
431, Combustion, for a residual process or apparatus of
combustion or combustion starting.
Subclass:
17.2
Liquid fuel burner:
This subclass is indented under subclass 17.1. Subject
matter wherein the fluid fuel is shapeless, virtually
incompressible, and has a definite volume.
Subclass:
18.1
Having heat exchange feature:
This subclass is indented under subclass 17.1. Subject
matter wherein the stand boiler includes means to transfer
heat from the burned fuel directly or through the interposing
fluid to the wall of the water containing chamber without
allowing them to mix.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclasses 376.1-391.1 for an open-top
liquid heating vessel that may include a lid having a heating
fluid confining, directing, or shielding feature; or subclass
390.1 for an open-top liquid heating vessel that may include
a lid having a heating wall structure.
165, Heat Exchange, for a residual heat transfer apparatus or
process.
Subclass:
18.2
Preheater:
This subclass is indented under subclass 18.1. Subject
matter wherein the heat exchange feature is used to transfer
heat, usually waste heat, to a fluid (e.g., air, liquid,
water, etc.) before it is heated by the stand boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
412-444, for a feed water heater.
SEE OR SEARCH CLASS:
431, Combustion, for a residual process or apparatus of
combustion or combustion starting, subclasses 207-248 for a
heated fuel line section that feeds a burner.
Subclass:
18.3
Fire tube or flue surrounded by water containing chamber:
This subclass is indented under subclass 18.1. Subject
matter wherein the heat exchange feature consists of the fire
tube or flue enclosed on all sides by the water containing
chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
44.1-45, for a residual boiler having a fire tube.
135.1-156, for a boiler having a large fire tube or flue
wholly or partly surrounded by the water space.
Subclass:
18.31
Penetrates one side of water chamber to another:
This subclass is indented under subclass 18.3. Subject
matter wherein the fire tube or flue passes through a wall of
the water chamber to an opposing wall.
Subclass:
18.4
Water tube surrounded by burned fuel:
This subclass is indented under subclass 18.1. Subject
matter wherein the heat exchange feature consists of the
water tube enclosed on all sides by the burned fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
235.11-365, for a boiler having a water tube through which
the water circulates or passes while being heated.
Subclass:
18.5
And external water tank:
This subclass is indented under subclass 17.1. Subject
matter and a closed receptacle outside of and for storing
water heated by the stand boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19.2 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) and a casing for the stand boiler or an
external tank therefor.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclasses 361.1-363.1 for a boiler
receiving hot liquid or steam from a stove or furnace (e.g.,
kitchen boiler, range boiler, etc.).
Subclass:
19.1
Water containing chamber or external tank having circulation
feature within:
This subclass is indented under subclass 13.01. Subject
matter wherein the water containing chamber or a closed
receptacle outside of and for storing water heated by the
stand boiler having means inside to direct the movement or
development of the water.
(1) Note. This may include means to create (e.g., inlet,
outlet, mixer, etc.) or prevent (e.g., baffle, dampener,
diffuser, etc.) circulation within the water chamber.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 362.1 for a boiler receiving hot
liquid or steam from a stove or furnace (e.g., kitchen
boiler, range boiler, etc.) having liquid circulation means
or subclass 365.1 for a liquid heating stovepipe having
liquid circulation means.
392, Electric Resistance Heating Devices, subclass 452 for a
line connected tank or container type liquid heater having an
immersion heating element and a baffle or guard to direct the
liquid.
Subclass:
19.2
And casing feature for stand boiler or external water tank
therefor:
This subclass is indented under subclass 13.01. Subject
matter and covering, jacketing, or sheathing means for the
stand boiler or a closed receptacle outside of and for
storing water heated by the stand boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
18.5 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a fluid fueled burner and an external
liquid tank.
494 for a miscellaneous casing surrounding a boiler.
SEE OR SEARCH CLASS:
29, Metal Working, subclass 455.1 for a method of assembling
or joining a spaced wall tube or receptacle.
220, Receptacles, subclass 592.22 and 592.23 for a thermally
insulated receptacle for heated contents (e.g., fireless
cooker, etc.) or subclass 694.1 for an external covering for
a hot water heater or boiler.
312, Supports: Cabinet Structure, subclass 236 for a cabinet
structure intended for heating, cooling, or heat exchange
means.
Subclass:
20
This subclass is indented under the class definition. Steam
generators or water heaters located either in the firebox,
combustion chamber, or offtake flue of a furnace whose main
purpose is not for the generation of steam or the heating of
water in such boiler. These boilers may be of any form
consisting of mere pipes or coils, hollow plates, or
cylinders with or without fire flues or tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6 10, 37, 38, 439, and 498, for analogous structure.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 5 for a cooking and heating
stove having a water heater or steam generator, subclass 31
for a cooking stove having a water heater in a flue
extension, subclass 34 for a cooking stove having a water
back, subclass 101 for a hot air furnace combined with a
boiler, subclasses 364.1 and 365.1 for a liquid heater
stovepipe, or subclasses 513 and 514 for a fireplace with a
liquid heater.
Subclass:
21
This subclass is indented under the class definition.
Boilers wholly or partly heated by chemical action other than
that of the combustion of fuel. This subclass includes that
type of liquid heater and steam generator known in the art as
"alkali" generators for steam.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, 263.01 for chemical heaters of
general utility.
Subclass:
22
This subclass is indented under the class definition.
Boilers not otherwise classifiable heated by solid or fluid
fuel or both combined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
16.1 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a solid fuel burner.
211 for sectional boilers heated by solid or fluid fuel.
Subclass:
23
This subclass is indented under the class definition.
Boilers not otherwise classifiable that are heated by fluid
fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for a boiler that generates steam to feed a fluid fuel
burner.
17.1-18.5, for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a fluid fuel burner.
41 for a fluid fueled flash boiler.
43 for a residual fluid fuel boiler having fire and water
tubes.
45 for a fluid fueled boiler having a fire tube.
115 for a fluid fueled boiler having a vertically positioned
fire tube.
156 for a fluid fueled boiler having a vertically positioned
flue.
161 for a fluid fueled boiler having a vertically positioned
flue surrounded by a concentrically spaced water shell.
167 for a fluid fueled boiler having a vertically positioned
flue where a water tube is within the flue.
177 for a fluid fueled boiler having a vertically positioned
flue where a water tube is within and extends transversely
across the flue.
179 for a fluid fueled boiler having a vertically positioned
flue where a water tube is within the flue and a small fire
tube is in alinement with the flue.
183 for a fluid fueled boiler having a vertically positioned
flue and a spiral water conduit.
208 for a boiler having a flat plate provided with a zigzag
passage heated by a fluid fuel burner.
210 for a sectional boiler heated by a fluid fuel burner.
211 for a sectional boiler able to use either a fluid or
solid fuel.
216 for a fluid fueled boiler formed of superimposed
horizontal sections that are in fluid communication with each
other at their centers.
236 for a fluid fueled boiler having a water tube through
which the water circulates or passes while being heated.
243 for a fluid fueled boiler having a tube passage that has
an extremely small cross-sectional area as compared with its
length.
245 for a fluid fueled boiler having a vertical stand pipe
around which extends a tubular coil or loop in direct or
indirect fluid communication with the stand pipe.
248 for a fluid fueled boiler having a horizontally coiled
water tube.
250 for a fluid fueled boiler having a vertically coiled
water tube.
274 for a fluid fueled boiler having a water tube in fluid
communication with a longitudinal upper drum.
283 for a fluid fueled boiler having a water tube looped
vertically over the firebox.
308 for a fluid fueled boiler having a central stand pipe
water tube and a radially projecting spur tube.
319 for a fluid fueled boiler having a vertical spur water
tube.
322 for a residual fluid fueled boiler having a standpipe
provided with a water tube.
328 for a fluid fueled boiler having a single upper drum,
plural lower drums, and water tubes that straddle the
combustion chamber.
333 for a fluid fueled boiler having a vertical water tube.
348 for a fluid fueled boiler having a water tube provided
with an internal fire tube.
356 for a fluid fueled boiler having a water tube where the
water zigzags through the tube.
446 447, for a boiler using other than automatic means to
regulate fluid fuel to a burner and water to the boiler.
Subclass:
24
This subclass is indented under subclass 23. Devices the
fuel combustion of which is intermittent and explosive.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 39.07 and 722+ for devices in
which the products of combustion enter the fluid chamber.
Subclass:
25
This subclass is indented under subclass 23. Devices
provided with a plurality of fluid fuel burners one above the
other.
Subclass:
26
This subclass is indented under the class definition.
Boilers heated by friction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
380 for boilers having mechanically operated cleaning
agitators.
411 for mechanical circulating devices.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, subclass 247 for other frictional
heaters.
Subclass:
27
This subclass is indented under the class definition.
Boilers heated by a noncombustible hot material, such as
slag, bars, or pigs of iron, or brick that does not come into
contact with the liquid to be heated.
Subclass:
28
This subclass is indented under the class definition.
Boilers heated by a noncombustible hot material, either
introduced into the water or having the water fed upon the
hot material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31.1 for fluid heated by injection of a hot fluid.
Subclass:
29
This subclass is indented under the class definition.
Boilers not otherwise classifiable which have an annular
firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
127 184, 246, 309, 323, and 335, for other boilers with an
annular firebox.
Subclass:
30
This subclass is indented under the class definition.
Boilers having fuel magazines and not otherwise
classifiable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5 46, 66, 92, 117, 124, 128, 136, 157, 158, 162, 168, 212,
219, 222, 237, 251, 272, 310, 320, 334, 339, 344, and 373,
for other boilers having fuel magazines.
SEE OR SEARCH CLASS:
110, Furnaces, 293 and the notes thereunder for other fuel
magazines.
Subclass:
31.1
INDIRECTLY HEATED SEPARATE INJECTED FLUID:
This subclass is indented under the class definition.
Devices in which heating of a fluid is by the injection of a
hot fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
28 for analogous devices used for noncombustible hot
material.
Subclass:
31.2
Submerged flame:
This subclass is indented under subclass 31.1. Devices
wherein the hot fluid is produced by an underwater
combustion.
Subclass:
32
This subclass is indented under the class definition.
Devices having two separate compartments not in
communication, the liquid to be vaporized being in one
compartment and heated by a hot fluid in the other
compartment.
(1) Note. Slag heated boilers, where the slag heats a fluid
like air or water which in turn imparts its heat to the water
in the steam making chamber and water evaporating apparatus
indirectly heated, provided the structure of such apparatus
must act as a vapor or steam generator, are classified in
this and its subsidiary subclasses. Even sugar evaporators
and vacuum pans are classified here if the structure is such
as to be of general application as a steam generator and the
discharge outlet for the syrup is only of such a character as
to be equally adapted for a blow-off conduit for sludge in a
steam generator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
483 for superheaters indirectly heated.
SEE OR SEARCH CLASS:
62, Refrigeration, subclass 45.1 for process and apparatus
for vaporizing liquefied gas requiring steps or means
involving pressure or temperature control special to
liquefied gas and more than required for other liquids.
165, Heat Exchange, appropriate subclasses for a heat
exchanger having two noncommunicating chambers not having a
vapor separator in a heated chamber.
210, Liquid Purification or Separation, 175 for a heater
combined with apparatus of that (210) class.
Subclass:
33
This subclass is indented under subclass 32. Devices,
provided with a furnace forming a part of the unitary
structure.
Subclass:
34
This subclass is indented under subclass 32. Devices having
an internal vapor or steam separator.
Subclass:
35
This subclass is indented under the class definition.
Boilers provided with one or more chambers in which the hot
boiler water or steam may be stored when less than the normal
amount of steam is being used, which may serve as a storage
reservoir for heat energy under abnormal demands for steam.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 659 for a heat operated power
system including a heat steam or compressed gas storage
means.
Subclass:
36
This subclass is indented under the class definition.
Boilers having means for passing exhaust steam through
conduits within the boiler or in surface contact therewith or
for passing live steam generated in the same boiler or in
another boiler into the water in the boiler. This subclass
includes processes for getting up steam by the injection of
live steam from one boiler into another boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
27 and 28, for boilers heated by slag or hot brick or bars
of iron.
31.1 for boilers heated by the injection of a liquid of a
kind that does not mix with the water in the boiler.
32 for boilers heated indirectly by another hot fluid.
407 for injector circulation systems.
463 for similar structure in steam treating superheaters.
509 for submerged chambers.
Subclass:
37
This subclass is indented under the class definition.
Boilers having separate water chambers, which may or may not
be in communication with each other at the top of the boiler.
Theses boilers are designed to be used either as steam
boilers for generating steam at different pressure or for
generating steam and also for heating water when it is
desired to have steam for one purpose and water heating for
other purposes, as for instance, using the steam for one set
of radiators and the water for another set, or for generating
steam or hot water for the radiators on one floor of a
building and for generating steam or hot water for radiators
on another floor, with separate circuits to each
compartment.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 for boilers provided with auxiliary water heaters, where
the water is heated or steam generated for separate use.
33 for boilers having separate compartments, where the water
is heated or steam generated indirectly by heat from water or
steam heated in another compartment of the boiler by a
furnace.
83 and 123, for boilers with separate compartments, where
the water is fed progressively from one compartment to the
next one.
125 420, 421, and 439, for water heaters heated by furnace
gases.
Subclass:
38
This subclass is indented under subclass 37. Devices at
least one compartment being for heating water to operate a
motor for regulating the combustion of the boiler furnace.
Subclass:
39
This subclass is indented under the class definition.
Boilers in which the liquid flows over the heating surface of
the boiler in a thin stream and occupies only a limited
portion of the boiler space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
218 and 242+, for capillary tubes.
258 for allied art.
501 for displacing elements in tubes causing the liquid to
spread in a thin film.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 359.1 for a fluid fuel burner
other than a top-accessible liquid heating vessel where the
liquid flows down a cylindrical or conical surface.
Subclass:
40
This subclass is indented under the class definition.
Boilers in which liquid is flashed into vapor as soon as it
enters the vapor generating chamber. The liquid may be
preheated in a chamber forming part of the unitary boiler
structure or preheated in a chamber separate from the main
vapor generator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 242+ and 260, for progressive heaters.
247 for progressively heated steam generators.
446 448.1, 449, and 452, for regulating devices for flashers
and progressively heated steam generators.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 39.05, 39.3, 39.53+, and 106, for
devices of that class having flash boilers.
219, Electric Heating, 271 for electrically heated flash
boilers.
Subclass:
41
This subclass is indented under subclass 40. Flash boilers
heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 248 and 250, for progressively heated fluid by a fluid
fuel burner.
446 448.1 and 452, for regulation of boilers.
Subclass:
42
This subclass is indented under the class definition.
Boilers provided with both water tubes and fire tubes not
otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 68+ and 98, for horizontal fire tube boilers with water
tubes.
113 for analogous art.
130 for vertical fire tube boilers provided with water
tubes.
138 140+, 149+, and 152, for horizontal flue boilers with
water tubes.
153 and 166+, for vertical flue boilers provided with water
tubes.
195 for horizontal cylindrical boilers with water tubes.
Subclass:
43
This subclass is indented under subclass 42. Devices heated
by fluid fuel.
Subclass:
44.1
FIRE TUBE:
This subclass is indented under the class definition.
Boilers having fire tubes not otherwise classifiable.
(1) Note. The term "fire tube" is used in a sense broad
enough to include both small tubes and large tubes forming
passages through a chamber when the size of the tube is
immaterial to the invention claimed; but patents disclosing
boilers provided with large fire tubes or "flues", where the
large size of the tubes is a material feature of the
structure and is necessary to the structure of the boiler and
its combination with other features, are classified under the
"flue" types of boilers, subclass 135, and the subclasses
thereunder, except in that type of boiler where the large
fire tube or flue be a subsidiary feature of the boiler,
which is manifestly of the small fire tube type, in which
case it is classified under the fire tube subclasses. See
for example, this class, subclasses 47, 48, 50, and 78.
(2) Note. When a large flue in a boiler is essential to the
structure and is not a mere subsidiary feature, such patents
are classified in the "flue" type of boiler, although small
fire tubes are an essential part of the combination, except
those type classified in this class, subclasses 47 and 48.
SEE OR SEARCH THIS CLASS, SUBCLASS:
37 for boilers having separate compartments having fire
tubes.
42 for miscellaneous combinations of fire tube and water
tube boilers, but only those that are not specially provided
for in the combination fire tube and water tube subclasses
under the fire tube or the flue type.
191 through 207, inclusive, under horizontal cylinder, for
horizontal cylindrical boilers having water heating
structures consisting of water tubes, drums, water walls, and
water chambers of various forms, in combination with the
boiler or being of such a configuration as to adapt it for
use with a horizontal cylindrical boiler provided fire tubes
are not essential to the boiler.
Subclass:
44.2
With baffle in flue:
This subclass is indented under subclass 44.1. Devices
wherein a static structure regulates the fluid flow in a
flue.
Subclass:
45
This subclass is indented under subclass 44. Fire tube
boilers heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
115 156, 161, 167, 179, and 183, for other fire tube or flue
boilers heated by fluid fuel.
Subclass:
46
This subclass is indented under subclass 44. Fire tube
boilers having a fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92 117, 124, and 128, for other fire tube boilers with
magazines.
157 162 and 168, for other flue boilers with magazines.
212 219 and 222, for sectional boilers with fuel magazines.
Subclass:
47
This subclass is indented under subclass 44. Devices having
a large horizontal flue, not covered by the definitions of
other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 and 78, for analogous art.
136 for horizontal flue boilers with transverse fire tubes.
149 for horizontal flue boilers with return fire tubes
within the same part of the boiler as the flue.
Subclass:
48
This subclass is indented under subclass 44. Devices having
a large vertical flue not covered by the definitions of other
subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
49 and 114+, for other vertical fire tubes.
Subclass:
49
This subclass is indented under subclass 44. Fire tube
boilers having both horizontal and vertical fire tubes.
Subclass:
50
This subclass is indented under subclass 44. Fire tube
boilers that are horizontal or somewhat inclined from the
horizontal having fire tubes that communicate with a large
flue within the boiler, that may serve as a firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
78 80, 95, and 149, for special features.
109 for inclined fire tube boilers.
Subclass:
51
This subclass is indented under subclass 44. Devices
comprising fire tube boilers that are horizontal not covered
by other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
47 for fire tube boilers with a large horizontal flue.
49 for horizontal fire tube boilers having vertical fire
tubes.
113 for horizontal boilers with transverse fire tubes.
136 for combinations of horizontal large flue boilers with
fire tubes, both horizontal and vertical.
Subclass:
52
This subclass is indented under subclass 51. Devices having
two or more boilers arranged side by side or superposed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
82 and 137, for horizontal flue boilers with the same
arrangement.
Subclass:
53
This subclass is indented under subclass 52. Devices with
water tubes in various arrangement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138 for horizontal flue boilers with water tubes.
Subclass:
54
This subclass is indented under subclass 51. Devices with a
firebox located midway its ends, having outlets for the
products of combustion opposite each other.
Subclass:
55
This subclass is indented under subclass 51. Subject matter
relating to the structure of single cylindrical boilers.
(1) Note. The Horizontal cylindrical subclasses for the
boiler features without the fire tubes.
Subclass:
56
This subclass is indented under subclass 51. Devices having
a separate and distinct boiler section provided with fire
tubes, located beneath the boiler, at the rear of the bridge
wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
81 85+, 110, and 191, for closely allied art.
Subclass:
57
This subclass is indented under subclass 51. Devices having
a two-part water firebox or the equivalent thereof, with
mechanism for passing the products of combustion from one
part of the firebox to the other part, in order that the
smoke may be consumed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
60 for similar functions with a different structure.
SEE OR SEARCH CLASS:
110, Furnaces, 208 for similar art.
Subclass:
58
This subclass is indented under subclass 51. Devices having
a water firebox united to and extending below the main body
of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
73 74 and 76+, for return fire tube horizontal fire tube
boilers with drop water fireboxes.
107 for horizontal fire tube boilers with water walls having
a drop water firebox.
139 141 and 146, for horizontal large flue boilers with drop
water fireboxes.
Subclass:
59
This subclass is indented under subclass 58. Devices with a
conduit located either inside or outside the boiler to
connect the water firebox with the opposite end of the boiler
to help the circulation of the water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 for water conduits provided with a sediment trap and
water heating tubes.
Subclass:
60
This subclass is indented under subclass 58. Devices made
with two compartments, with means for alternately passing the
products of combustion from one compartment to the other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57 for water fireboxes with alternate smoke return
features.
95 for plural fireboxes.
SEE OR SEARCH CLASS:
110, Furnaces, 208 for similar functions in the furnace
art.
Subclass:
61
This subclass is indented under subclass 58. Devices with a
water baffle depending from the top of the firebox, formed
either by walls spaced apart or water tubes, or water tubes
combined with fire brick, or water walls.
SEE OR SEARCH THIS CLASS, SUBCLASS:
188 for analogous art.
SEE OR SEARCH CLASS:
110, Furnaces, 324 for similar art.
Subclass:
62
This subclass is indented under subclass 58. Devices with
both front and rear water baffles for the products of
combustion.
SEE OR SEARCH THIS CLASS, SUBCLASS:
71 for rear baffles having water tubes on which rests
brickwork.
SEE OR SEARCH CLASS:
110, Furnaces, 322, 331+ and 336+ for similar functions in
the combustion art.
Subclass:
63
This subclass is indented under subclass 58. Devices with a
water baffle in the front of the firebox.
Subclass:
64
This subclass is indented under subclass 58. Devices with a
separate combustion chamber between the firebox and the fire
tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
95 and 100, for other types of boilers with an interposed
combustion chamber between the firebox and the fire tubes.
Subclass:
65
This subclass is indented under subclass 58. Devices, with a
water baffle in the rear of the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
62 for analogous art.
71 for solid baffles, supported by water tubes.
SEE OR SEARCH CLASS:
110, Furnaces, 331 and 336+ for similar art.
Subclass:
66
This subclass is indented under subclass 58. Devices
containing a water-cooled coking chamber for fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
67 and 92, for analogous art.
SEE OR SEARCH CLASS:
110, Furnaces, 230 for similar art.
Subclass:
67
This subclass is indented under subclass 58. Devices with a
plurality of fuel chambers, one of which at least has a water
grate, the products of combustion from the fuel chambers
meeting each other. The fuel chambers are generally
superposed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for boilers of this type when the upper fuel chamber is a
coking chamber.
371 for grate structure.
Subclass:
68
This subclass is indented under subclass 58. Devices with
some form of water chamber, conduits or tubes in the
firebox.
Subclass:
69
This subclass is indented under subclass 68. Devices with
check valves so arranged that water from the boiler
circulates through the chambers, conduits or tubes until feed
water is being fed thereto, when the boiler circulation is
cut off.
SEE OR SEARCH THIS CLASS, SUBCLASS:
118 for similar art.
196 for check valved feed heaters for horizontal
cylindrical boilers.
Subclass:
70
This subclass is indented under subclass 68. Devices with
air feeding conduits.
Subclass:
71
This subclass is indented under subclass 68. Devices with
solid baffle brick combined with the tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61 65, 68, and 69, for analogous art.
SEE OR SEARCH CLASS:
110, Furnaces, 324 for similar art disclosed.
Subclass:
72
This subclass is indented under subclass 51. Devices having
the end of the boiler projecting into the firebox or
overhanging the fire grate.
Subclass:
73
This subclass is indented under subclass 72. Devices
projecting into a drop water firebox.
Subclass:
74
This subclass is indented under subclass 51. Devices having
a drop water firebox so arranged that the products of
combustion pass a plurality of times through the boiler or
underneath, through or over the boiler, and are discharged at
the outlet flue located at the end of the boiler farthest
from the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
73 for tubes merely projecting into a firebox.
Subclass:
75
This subclass is indented under subclass 51. Devices so
arranged that the products of combustion pass through the
boiler in opposite directions two or more times before they
enter the outlet flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54 72+, 81, and 85, for other structure which includes return
features.
87 for horizontal fire tube boilers having U-shaped
couplings for the fire tubes.
149 for horizontal flue boilers having return fire tubes.
Subclass:
76
This subclass is indented under subclass 75. Devices having
a water walled firebox depending from the boiler so arranged
that the products of combustion pass directly through the
lower tubes and return to the front of the boiler through the
upper tubes and are discharged to the outlet flue at this
point.
Subclass:
77
This subclass is indented under subclass 76. Devices having
water tubes within some of the flues or fire tubes, which may
extend into the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
141 and 146, for allied art.
Subclass:
78
This subclass is indented under subclass 75. Devices having
a water firebox of the large flue type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 for similar structure in horizontal or inclined tubes.
Subclass:
79
This subclass is indented under subclass 51. Devices having
a water heating arch, formed of metal walls spaced apart,
located beneath the boiler, extending either only over the
firebox or along the whole combustion chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103 and 105, for subjacent water arches formed of
water-tubes.
Subclass:
80
This subclass is indented under subclass 51. Devices having
one or more cylindrical sections, provided with large flues
located below the main boiler and in communication therewith.
The large flues generally inclose the fuel grate and serve
as a firebox. At the rear of the large flues there may or
may not be small fire tubes in alinement therewith.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 and 241, for analogous art.
Subclass:
81
This subclass is indented under subclass 51. Devices having
a water chamber depending from the main boiler, provided with
transverse fire tubes and located in rear of the bridge
wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56 85, 86, 110, and 191, for analogous art.
Subclass:
82
This subclass is indented under subclass 51. Devices having
a feed water heater located above the main boiler, in the
combustion flue, heated by the products of combustion, and in
open communication with the water space of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
443 for superposed feed heaters in communication with the
boiler steam space.
Subclass:
83
This subclass is indented under subclass 51. Devices having
compartments separated by metal diaphragms transversely
arranged inside the boiler, or to boilers having a combustion
chamber intermediate the ends, with transverse diaphragms at
each end of the combustion chamber, or to separate boilers in
alinement. This subclass includes patents for progressively
heating water fed to the boiler and also where the diaphragm
is only for supporting the tubes to prevent vibration or
where the diaphragms are for circulation purposes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
101 123, for vertical fire tube boilers with transverse
diaphragms and having separate compartments.
125 151 and 425, for analogous structure.
Subclass:
84
This subclass is indented under subclass 51. Devices having
two diameters, with that part of the boiler having the
greater diameter over the firebox. The great diameter is
offset from the main boiler, and the offset portion has short
fire tubes passed therethrough, while long fire tubes extend
through the whole length of the boiler. The products of
combustion pass out of the firebox and return through the
short tubes in the offset portion, and then pass in an
opposite direction to the other end of the boiler, where the
outlet flue is located, or they may return and pass through
the upper short tubes and leave the boiler at the outlet flue
located at the firebox end.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56 81, 85, and 86, for similar art.
Subclass:
85
This subclass is indented under subclass 51. Devices having
two diameters, the small diameter being over the firebox and
the large diameter being beyond the bridge wall. The offset
portion of the large diameter is provided with longitudinally
extending fire tubes, through which the products of
combustion from the firebox pass and then are passed through
return fire tubes extending the whole length of the boiler.
The products of combustion may then pass to the outlet flue
at the front end of the boiler, or they may pass rearwardly
above the boiler to the outlet flue located at the rear end,
and in their final rearward passage may pass through fire
tubes in an upwardly offset portion of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56 81, 86, 110, and 191, for analogous structure.
Subclass:
86
This subclass is indented under subclass 85. Devices having
a water firebox.
Subclass:
87
This subclass is indented under subclass 51. Devices
provided with U-shaped couplings connecting the fire tubes at
the ends of the boiler, in order that the products of
combustion may flow back and forth through the fire tubes in
succession.
SEE OR SEARCH THIS CLASS, SUBCLASS:
75 for miscellaneous boilers of the horizontal fire-tube
type where the products of combustion pass back and forth
through the fire tubes.
360 for U-couplings.
Subclass:
88
This subclass is indented under subclass 51. Devices having
a superposed horizontal upper-drum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 486 and 492, for special features.
Subclass:
89
This subclass is indented under subclass 51. Devices
provided with a water-cooled arch over the combustion chamber
at the rear of the fire tubes. This arch may be formed of
plates spaced apart or of water tubes or water tubes combined
with solid material like firebrick.
Subclass:
90
This subclass is indented under subclass 51. Devices having
a water firebox that are not otherwise classified.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 for horizontal or inclined fire tube boilers having a
large flue for the firebox.
58 for horizontal fire tube boilers with drop water
fireboxes.
73 for horizontal fire tube boilers with the barrel of the
boiler projecting into the firebox, which is of the drop
water firebox type.
74 and 75+, for return fire tube boilers with water
fireboxes.
107 for water walls with drop water fireboxes.
139 and 141, for water fireboxes with other types of
horizontal flue boilers.
149 for boilers having a large flue, with a water firebox.
189 193+, for water fireboxes for horizontal cylindrical
boilers which may or may not have horizontal fire tubes.
Subclass:
91
This subclass is indented under subclass 90. Devices with
some form of water heating chamber or conduits within the
firebox, connected in circuit with the main part of the
boiler, with some form of sediment trap in the water
circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
59 for circulating conduits with water heaters in the
firebox.
202 for horizontal cylindrical boilers having water heating
tubes or chambers in circuit with the boiler, with a sediment
trap in the circuit.
380 and 403, for analogous art with a trapped circuit.
Subclass:
92
This subclass is indented under subclass 90. Devices
provided with a fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
46 and 66, for miscellaneous fire tube boilers with a fuel
magazine.
Subclass:
93
This subclass is indented under subclass 90. Devices,
wherein the water firebox is offset at the end of the boiler
so that the products of combustion pass from the firebox
directly into the fire-tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189 and 190, for offset water fireboxes so arranged that the
products of combustion pass beneath the boiler upon leaving
the firebox.
Subclass:
94.1
Water tube type:
This subclass is indented under subclass 93. Devices
composed of water tubes in whole or in part.
Subclass:
95.1
Plural with common combustion chamber:
This subclass is indented under subclass 90. Devices, having
multiple fireboxes and in communication with a common
combustion chamber located between the fireboxes and the fire
tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57 60 and 96, for horizontal fire tube boilers having a
plurality of water fireboxes.
64 and 100, for horizontal fire tube boilers having a water
firebox, with a combustion chamber between the firebox and
fire-tubes.
Subclass:
95.2
Multiboilers:
This subclass is indented under subclass 95.1. Devices
having multiple chambers for heating fluids.
Subclass:
96
This subclass is indented under subclass 90. Devices in
which the water fireboxes are superposed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
66 and 67, for special types of superposed fuel chambers.
Subclass:
97
This subclass is indented under subclass 90. Devices having
a downdraft water grate.
Subclass:
98
This subclass is indented under subclass 90. Devices having
an updraft water grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
374 377 and 378, for structure of grate.
Subclass:
99
This subclass is indented under subclass 90. Devices having
water tubes therein straddling the fuel chamber.
Subclass:
100
This subclass is indented under subclass 90. Devices of the
water tube type constructed wholly or in part of water tubes,
with an interposed large flue between the firebox and the
fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64 94 and 95, for combustion chambers interposed between
firebox and fire tubes.
Subclass:
101
This subclass is indented under subclass 51. Devices having
a water cooled smoke-box.
SEE OR SEARCH THIS CLASS, SUBCLASS:
151 423, 425, and 426, for special features.
Subclass:
102
This subclass is indented under subclass 51. Devices having
water tubes extending horizontally over the bridge wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
154 for horizontal flue boilers with water tubes over the
bridge wall.
195 for horizontal cylindrical boilers having fire tubes,
with water tubes extending horizontally over the bridge wall,
where it is immaterial whether the boiler is provided with
fire tubes or not.
263 for water tube boilers having water tubes horizontal
over the bridge wall.
Subclass:
103
This subclass is indented under subclass 51. Devices having
water tubes in the rear of the fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
89 and 195, for related art.
150 for closely allied art.
153 for horizontal flue boilers with water tubes.
Subclass:
104
This subclass is indented under subclass 51. Devices having
rearwardly declined water tubes over the bridge wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
108 and 154, for horizontal flue boilers, with water-tubes
over the bridge wall.
195 for horizontal cylindrical boilers provided with various
kinds of water-tubes in the combustion chamber.
291 and 296, for rearwardly declined water-tubes over the
bridge wall, having a longitudinally posited drum without
fire-tubes over the water-tubes.
Subclass:
105
This subclass is indented under subclass 51. Devices having
water tubes inclined rearwardly over the bridge wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
108 and 154, for horizontal flue boilers with water tubes
over the bridge wall.
265 for rearwardly inclined water tube boilers over the
bridge wall.
Subclass:
106
This subclass is indented under subclass 51. Devices having
water walls at the sides, front, or rear of the boiler, or at
all of said locations. The wall may also extend across the
boiler below the combustion chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107 and 108, for similar art.
Subclass:
107
This subclass is indented under subclass 106. Devices having
a water walled firebox depending from the boiler structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
76 and 149, for closely related art.
Subclass:
108
This subclass is indented under subclass 106. Devices having
some form of water tubes between the walls in the combustion
chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
135 for closely allied structure.
Subclass:
109
This subclass is indented under subclass 44. Devices placed
in inclined position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
47 50, 51, 54, and 110, for boilers having some of the fire
tubes inclined.
Subclass:
110
This subclass is indented under subclass 44. Subject matter
relating to horizontally disposed boilers having transverse
fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56 and 191, for analogous art.
81 for horizontal fire tube boilers with transverse fire
tubes.
113 for combinations of transverse fire tubes, with water
tubes.
Subclass:
111
This subclass is indented under subclass 44. Subject matter
relating to vertical boilers having transverse fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
187 for vertical flue boilers with transverse fire tubes.
Subclass:
112
This subclass is indented under subclass 111. Devices having
a water firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
187 for vertical flue boilers having fire tubes extending
from the inner large flue to the outside of the boiler.
220 for sectional boilers.
Subclass:
113
This subclass is indented under subclass 44. Devices having
fire tubes extending transversely through the boiler and also
having water tubes in communication with the boiler.
Subclass:
114
This subclass is indented under subclass 44. Devices placed
in vertical position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 for boilers having auxiliary water heaters.
37 for vertical fire tube boilers having separate boiler
compartments which may or may not be in communication with
each other (one of which compartments may be used as a water
heater and the other as a steam generator.)
40 for flash boilers with vertical fire tubes.
42 for combinations of water tube and fire tube boilers of a
miscellaneous character.
48 for combinations of fire tube boilers with vertical flue
boilers or fire tube boilers having a large vertical flue of
a miscellaneous character.
49 for boilers having both horizontal and vertical tubes.
110 for horizontally disposed boilers with transverse
vertical fire tubes.
115 and 119, for vertical cylindrical boilers with vertical
fire tubes.
178 for vertical cylindrical fire tubes above and in
alinement with a vertical flue in the boiler.
Subclass:
115
This subclass is indented under subclass 114. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22 for miscellaneous boilers heated by solid or fluid fuel.
23 for miscellaneous boilers heated by fluid fuel.
24 for boilers heated by fluid fuel which is exploded while
burning.
43 for combined fire tube and water tube boilers heated by
fluid fuel that are of a miscellaneous nature.
156 for vertical flue boilers heated by fluid fuel.
161 and 183, for other types of vertical flue boilers heated
by fluid fuel.
167 177 and 179, for vertical flue boilers combined with
internal water tubes and heated by fluid fuel.
Subclass:
116
This subclass is indented under subclass 114. Devices
provided with a large space or dome at the lower end of the
boiler, extending into the boiler, located over the firebox,
with the tubes disposed around the dome.
Subclass:
117
This subclass is indented under subclass 114. Devices having
a centrally disposed fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30 for miscellaneous magazine boilers.
128 for vertical fire tube boilers having a water fire box
and a central fuel magazine.
157 and 168, for vertical flue boilers with a central fuel
magazine.
Subclass:
118
This subclass is indented under subclass 114. Devices having
sleeves, cylinders, or tubes arranged inside the boiler for
aiding the boiler circulation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
159 for similar devices within a vertical flue boiler.
408 for similar structure in circulation devices.
Subclass:
119
This subclass is indented under subclass 114. Devices in
vertical cylindrical boilers.
Subclass:
120
This subclass is indented under subclass 114. Devices having
an offset firebox out of alinement with the fire tubes. The
firebox is generally of the water firebox type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
175 for vertical flue boilers with an offset water firebox.
Subclass:
121
This subclass is indented under subclass 114. Devices
provided with fire tubes through which the products of
combustion pass upon leaving the firebox and also fire tubes
through which the products of combustion return to the other
end of the boiler before they enter the outlet flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128 for this type of boiler having a central magazine.
182 for vertical flue boilers having return fire tubes.
Subclass:
122
This subclass is indented under subclass 121. Devices having
a water firebox. The return fire tubes may be through the
same boiler section or in another boiler section placed
beside the other.
Subclass:
123
This subclass is indented under subclass 114. Devices
provided with separate compartments either by diaphragms
extending across the tubes or by complete boiler sections
superposed or placed side by side, and having the feed water
introduced into the compartment farthest from the fire box.
SEE OR SEARCH THIS CLASS, SUBCLASS:
83 for horizontal fire tube boilers having a progressive
heating of the feed water.
122 and 125, for analogous art.
Subclass:
124
This subclass is indented under subclass 114. Devices having
a fuel magazine disposed on one or more sides of the boiler.
Subclass:
125
This subclass is indented under subclass 114. Devices having
a separate water chamber above the steam space, through which
the fire tubes pass to prevent the leaking of flue joints or
to heat feed water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
83 123 and 164, for similar art.
Subclass:
126
This subclass is indented under subclass 114. Devices having
a water firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 and 178+, for analogous structure.
120 for offset fireboxes.
122 for return fire tube vertical fire tube boilers with a
water firebox.
Subclass:
127
This subclass is indented under subclass 126. Devices in the
form of a ring or the like.
SEE OR SEARCH THIS CLASS, SUBCLASS:
29 for annular fireboxes with miscellaneous types of
boilers.
184 for vertical flue boilers with an annular firebox.
Subclass:
128
This subclass is indented under subclass 126. Devices having
a water firebox and a central fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117 for miscellaneous vertical fire tube boilers having a
central fuel magazine.
157 and 168, for vertical flue boilers with a central
magazine.
Subclass:
129
This subclass is indented under subclass 114. Devices having
a downdraft water grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
371 for miscellaneous boilers with water grates.
Subclass:
130
This subclass is indented under subclass 114. Devices having
some form of water tubes, not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
166 for vertical flue boilers with water tubes in the
flues.
Subclass:
131
This subclass is indented under subclass 130. Devices in
which the water tubes are within the fire tubes.
Subclass:
132
This subclass is indented under subclass 130. Devices in
which the water tubes are looped and arranged around the
boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
185 for vertical flue boilers with looped water tubes around
a stand pipe within the flue.
244 and 281, for water tube boilers having a stand pipe with
water tubes surrounding it.
Subclass:
133
This subclass is indented under subclass 130. Devices in
which the water tubes are of the spur type.
Subclass:
134
This subclass is indented under subclass 44. Devices in
which the tubes are in the form of a volute.
SEE OR SEARCH THIS CLASS, SUBCLASS:
261 for water tubes of similar form. (See also the search
notes thereunder.)
Subclass:
135.1
FLUE:
This subclass is indented under the class definition.
Boilers having one or more large fire tubes or flues wholly
or partly surrounded by the water space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6 for industrial furnace boilers.
20 37, 47, and 48, for combinations of miscellaneous fire
tube and flue boilers.
368 for miscellaneous water fire boxes.
Subclass:
135.2
Alternative stack:
This subclass is indented under subclass 135.1. Devices
having a substitute flue or fire tube.
Subclass:
135.3
Sinusoidal flue:
This subclass is indented under subclass 135.1. Devices
wherein the flue turns back on itself in an undulating
manner.
Subclass:
136
This subclass is indented under subclass 135. Subject matter
placed horizontally, not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
47 for miscellaneous fire tube boilers having a large
horizontal flue.
78 for horizontal return fire tube boilers with a horizontal
flue firebox.
80 for horizontal fire tube boilers with a large flue boiler
section beneath the boiler.
409 for similar structure used in regulating circulation.
Subclass:
137
This subclass is indented under subclass 136. A plurality of
devices either posited side by side or superposed one above
the other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
52 for similar arrangement of fire tube boilers.
Subclass:
138
This subclass is indented under subclass 137. Devices having
water tubes in communication with the boilers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 102, 104, and 105, for structure including horizontal flue
boilers.
140 for horizontal flue boilers with internal water tubes.
153 for horizontal flue boilers with water tubes exterior of
the boiler.
195 for horizontal cylindrical fire-tube boilers with
similar arrangement.
Subclass:
139
This subclass is indented under subclass 136. Devices with a
drop water firebox at one end of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58 for horizontal fire tube boilers with drop water firebox
of analogous structure.
141 146 and 148, for other types of horizontal flue boilers
with drop water fireboxes.
Subclass:
140.1
Internal water tube:
This subclass is indented under subclass 136. Devices having
some form of water tubes in the flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
43 for horizontal flue boilers having internal water tubes
heated by fluid fuel.
154 for water tubes within a large horizontal flue.
Subclass:
140.2
Having water tube in flue:
This subclass is indented under subclass 140.1. Devices
wherein the water tube is in the flue.
Subclass:
141
This subclass is indented under subclass 140. Devices having
a drop water firebox with longitudinal water tubes in the
flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
77 and 146, for allied art.
Subclass:
142
This subclass is indented under subclass 140. Devices having
return fire tubes, with some form of water tubes within the
large flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
77 for analogous art.
147 for horizontal flue boilers having return fire tubes,
with transverse water tubes in the flues.
149 for horizontal flue boilers with return fire tubes.
Subclass:
143
This subclass is indented under subclass 140. Devices having
spur water tubes in the flue.
Subclass:
144
This subclass is indented under subclass 140. Devices having
water tubes in the flue, with a firebox located beneath the
boiler.
Subclass:
145
This subclass is indented under subclass 140. Devices having
water tubes extending across the flues and communicating with
the boiler at both ends.
SEE OR SEARCH THIS CLASS, SUBCLASS:
143 for spur tubes in the flue.
Subclass:
146
This subclass is indented under subclass 145. Devices having
a drop-water-firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
77 for analogous art.
141 for the same structure with longitudinally placed water
tubes in the flue.
Subclass:
147
This subclass is indented under subclass 145. Devices having
small fire-tubes, through which the products of combustion
pass, after leaving the large horizontal flues, in an
opposite direction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
142 146 and 149, for special features.
143 for large flues having spur water tubes therein.
Subclass:
148
This subclass is indented under subclass 140. Devices having
a water firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
77 for similar art.
141 for horizontal flue boilers with a drop water firebox,
with water tubes in the flue, running longitudinally.
146 for horizontal flue boilers with transverse water tubes
and with a drop water firebox.
Subclass:
149
This subclass is indented under subclass 136. Devices having
horizontally disposed small fire tubes, through which the
products of combustion are returned through the boiler after
leaving the large flues. The firebox is generally located in
the large flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
47 for miscellaneous boilers having fire tubes with a
horizontal flue.
74 76 and 107, for related art in the fire tube type of
boiler.
141 146, 150, 151, and 410, for other types of horizontal
flue boilers having return fire tubes.
Subclass:
150
This subclass is indented under subclass 149. Devices with
water tubes at the rear of the flues and fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103 for similar art in a fire tube type of boiler.
Subclass:
151
This subclass is indented under subclass 150. Devices having
a separate compartment at the rear of the fire tubes and
flues in which feed water may be heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
425 for similar structure.
Subclass:
152
This subclass is indented under subclass 136. Devices with
some form of water grate within the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
371 for structure of water grates.
Subclass:
153
This subclass is indented under subclass 136. Devices having
water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
102 through 105, for horizontal fire tube boilers with water
tubes.
138 for plural boilers with water tubes.
Subclass:
154
This subclass is indented under subclass 153. Devices in
which the water tubes extend over the bridge wall in the
flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
77 102, 104, 105, and 108, for related structure.
141 for closely allied art in the horizontal flue type of
boiler.
Subclass:
155.1
Vertical:
Subject matter under subclasses 135.1+ placed upright.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 for miscellaneous fire tube boilers having a vertical
flue.
Subclass:
155.2
With flue baffle:
This subclass is indented under subclass 155.1. Device
wherein a static structure regulates the fluid flow in a
flue.
Subclass:
155.3
Having exterior heating flue:
This subclass is indented under subclass 155.1. Devices
wherein the flue is located on the outside of a fluid tank.
Subclass:
155.4
Having corrugated flue:
This subclass is indented under subclass 155.1. Devices
where the flue has parallel and alternating ridges and
grooves.
Subclass:
155.5
Having undulating flue:
This subclass is indented under subclass 155.1. Devices
wherein the flue is shaped in wavelike or sinusoidal form.
Subclass:
156
This subclass is indented under subclass 155. Vertical flue
boilers heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
22 for miscellaneous boilers heated by solid or fluid fuel.
23 for miscellaneous boilers heated by fluid fuel.
115 for vertical fire tube boilers heated by fluid fuel.
161 167, 177, 179, and 183, for other types of vertical flue
boilers heated by fluid fuel.
Subclass:
157
This subclass is indented under subclass 155. Vertical flue
boilers having a centrally posited fuel magazine not
otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117 and 128, for vertical fire tube boilers with central
magazines.
162 and 168, for other vertical flue boilers having a
central fuel magazine.
Subclass:
158
This subclass is indented under subclass 157. Devices in
which the magazine is water jacketed.
Subclass:
159
This subclass is indented under subclass 155. Vertical flue
boilers having internal tubes, cylinders, or sleeves inside
the boiler space for increasing the circulation of water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
118 for similar art.
408 for circulation features of a general character.
Subclass:
160
This subclass is indented under subclass 155. Vertical flue
boilers comprising a plurality of concentrically posited
annular water shells formed of walls spaced apart.
SEE OR SEARCH THIS CLASS, SUBCLASS:
158 for special forms of this type of boiler.
Subclass:
161
This subclass is indented under subclass 160. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
183 for spiral water conduits.
Subclass:
162
This subclass is indented under subclass 160. Devices having
a centrally disposed fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
157 for more generally constructed boilers with a central
fuel magazine.
Subclass:
163
This subclass is indented under subclass 155. Vertical flue
boilers having a steam or water drum located outside of the
main boiler structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 for similar art.
Subclass:
164
This subclass is indented under subclass 155. Vertical flue
boilers having the outlet flue through the steam space of the
boiler provided with a heat insulator to prevent heating the
steam space. This insulator may be of some packing material
or formed by an air chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
125 for vertical fire tube boilers with top water chambers.
Subclass:
165
This subclass is indented under subclass 155. Devices within
which is some form of water heater other than water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
160 and 185, for allied art.
166 for vertical flue boilers having internal water tubes.
Subclass:
166.1
With internal water tube:
Vertical flue boilers under subclasses 155.1+ having water
tubes within the flue in communication with the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
131 for vertical water tube boilers with water tubes in the
flues.
184 through 187, for vertical flue boilers having a central
standpipe provided with water tubes located in the vertical
flue.
468 for boilers of that type having steam superheater.
Subclass:
166.2
Loop-type tube:
This subclass is indented under subclass 166.1. Devices
wherein the water tube is folded back and joined at the
ends.
Subclass:
167
This subclass is indented under subclass 166. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
161 177, 179, and 183, for other types of vertical flue
boilers heated by fluid fuel.
Subclass:
168
This subclass is indented under subclass 166. Devices with a
fuel magazine centrally located in the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117 and 128, for vertical fire tube boilers with a central
magazine.
158 and 162, for other vertical flue boilers having a
central fuel magazine.
Subclass:
169
This subclass is indented under subclass 166. Devices having
coiled water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
244 and 247+, for structure of coiled water tubes.
Subclass:
170
This subclass is indented under subclass 169. Devices in
which the coils communicate with headers located within the
flue.
Subclass:
171
This subclass is indented under subclass 166. Devices, with
the inlet opening to the flue of smaller diameter than the
flue, and having water tubes within the flue. There may or
may not be a water firebox below the contracted inlet.
SEE OR SEARCH THIS CLASS, SUBCLASS:
175 and 179, for similar art.
Subclass:
172
This subclass is indented under subclass 166. Devices having
water tubes in communication with headers located within the
flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
170 for vertical flue boilers having coiled water tubes
communicating with heaters located in the flue.
178 for similar structures of water tubes.
Subclass:
173
This subclass is indented under subclass 166. Devices having
horizontal spur water tubes within the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for vertical fire tube boilers with spur water tubes.
180 and 181, for other types of vertical flue boilers having
spur water tubes.
Subclass:
174
This subclass is indented under subclass 166. Devices in
which the water tubes are provided with internal fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
242 for capillary tubes of this type.
271 and 348, for vertical water tubes with internal fire
tubes.
Subclass:
175
This subclass is indented under subclass 166. Devices
provided with an offset water firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120 for vertical fire tube boilers with offset water
fireboxes.
Subclass:
176
This subclass is indented under subclass 166. Devices in
which the water tubes extend transversely across the flue and
communicating at both ends with the boiler.
Subclass:
177
This subclass is indented under subclass 176. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
179 and 183, for other types of vertical flue boilers heated
by fluid fuel.
Subclass:
178
This subclass is indented under subclass 166. Devices having
small fire tubes in alinement with the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 and 126, for analogous structures in the fire tube art.
Subclass:
179
This subclass is indented under subclass 178. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
115 167 and 171, for analogous art.
Subclass:
180
This subclass is indented under subclass 178. Devices having
spur water tubes within the large flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for vertical fire tube boilers having spur water tubes.
173 and 181, for vertical flue boilers having spur water
tubes without the vertically alined fire tubes.
186 for vertical flue boilers having a spur water tube stand
pipe within the flue.
Subclass:
181
This subclass is indented under subclass 166. Devices having
vertical spur water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for vertical fire tube boilers, with vertical spur water
tubes.
Subclass:
182.1
With return fire tube:
Devices under subclasses 155.1+ having small vertical fire
tubes, through which the products of combustion are returned
through the boiler after leaving the large flues. The fire
tubes may be within the same boiler section as the large flue
or in a separate boiler section.
SEE OR SEARCH THIS CLASS, SUBCLASS:
121 and 122, for return fire tube vertical fire tube
boilers.
Subclass:
182.2
Having symmetrical arrangement of tubes:
This subclass is indented under subclass 182.1. Devices
wherein the fire tubes are ordered in a balanced
relationship.
Subclass:
182.3
This subclass is indented under subclass 182.1. Having tubes
offset from firebox: Devices wherein the fire tubes are not
directly in line with the combustion chamber.
Subclass:
183
This subclass is indented under subclass 155. Devices
comprising one or more annular chambers having spiral water
passages vertically posited, with or without a fluid fuel
burner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
161 and 501+, for related art.
Subclass:
184
This subclass is indented under subclass 155. Devices having
a stand pipe provided with water tubes or merely a vertical
pipe extending downwardly within the flue through the fuel
grate to form an annular firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
29 for miscellaneous boilers with an annular fire tube.
127 for vertical fire tube boilers with an annular water
firebox.
Subclass:
185
This subclass is indented under subclass 155. Devices having
a vertical stand pipe, with looped water tubes located within
the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
215 for similar art in sectional boilers.
244 and 281, for structure of stand pipe and water tubes.
Subclass:
186
This subclass is indented under subclass 155. Devices having
a stand pipe provided with spur water tubes located within
the flue.
SEE OR SEARCH THIS CLASS, SUBCLASS:
184 for similar structure.
215 for similar art in sectional boilers.
307 for spur water tube stand pipe structure.
Subclass:
187
This subclass is indented under subclass 155. Devices having
fire tubes extending transversely through the annular water
chamber formed by the inner and outer walls of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for vertical boilers with transverse fire tubes
extending through the whole boiler.
Subclass:
188
This subclass is indented under the class definition.
Horizontal cylindrical boilers provided with a depending
water-cooled baffle for the products of combustion, formed
either of plates spaced apart, water tubes, or the
combination of either of these with firebrick or some solid
material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61 for drop baffles in the water firebox.
Subclass:
189
This subclass is indented under the class definition.
Horizontal cylindrical boilers having an offset subjacent
firebox provided with a water-cooled roof. The firebox in
addition to the water roof may also have one or more of its
walls water-cooled, thereby forming an offset subjacent water
firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
93 for offset water fireboxes for a horizontal fire tube
boiler.
190 for offset fireboxes, for horizontal cylinder boilers.
209 and 213, for this feature in sectional boilers.
238 336 and 352, for water tube boilers with offset
fireboxes.
Subclass:
190
This subclass is indented under the class definition.
Horizontal cylindrical boilers having an offset subjacent
firebox having water tubes surrounding the fuel space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
194 for analogous art.
Subclass:
191
This subclass is indented under the class definition.
Horizontal cylindrical boilers having subsidiary fire tube
section of the boiler beyond the bridge wall. The fire tubes
may be either vertical or horizontal, and if horizontal may
extend either longitudinally or transversely of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56 81 and 85+, for closely allied structure.
Subclass:
192
This subclass is indented under the class definition.
Horizontal cylindrical boilers having a water-cooled bridge
wall.
Subclass:
193
This subclass is indented under the class definition.
Horizontal cylindrical boilers having a firebox located
beneath one end of the boiler and having one or more water
walls forming the sides of the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58 and 90+, for horizontal fire tube boilers with various
types of water fireboxes.
139 141 and 146, for horizontal flue boilers with water
fireboxes.
188 for drop water baffles.
189 for water cooled roofs.
Subclass:
194
This subclass is indented under subclass 193. Devices having
a series of water tubes either embedded in the walls of the
firebox or located just inside the walls surrounding the fuel
space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
190 for offset subjacent fireboxes.
Subclass:
195
This subclass is indented under the class definition.
Horizontal cylindrical boilers having some form of water
tubes, water chambers, or drums in communication therewith.
The cylindrical boiler may or may not be provided with fire
tubes or flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45 47, 48, 49, 50, and 51+, for various types of horizontal
fire tube boilers provided with water tubes, waterwalls,
drums, or chambers.
136 for horizontal cylindrical boilers having large flues
therein and provided with water tubes, water walls, drums, or
water heating chambers.
Subclass:
196
This subclass is indented under subclass 195. Devices
through which the boiler water circulates and is heated, with
check valves so arranged that the feed water when introduced
flows through the tubes and is heated therein and is not
permitted to enter the boiler directly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
69 for a similar arrangement of valves.
Subclass:
197
This subclass is indented under subclass 195. Devices
extending longitudinally on the sides thereof.
Subclass:
198
This subclass is indented under subclass 195. Devices
arranged vertically on the sides thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51 53, 138, and 153+, for analogous art.
Subclass:
199
This subclass is indented under subclass 198. Devices in
which the tubes are on each side of the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
68 and 94, for analogous art.
Subclass:
200
This subclass is indented under subclass 195. Devices placed
over the fuel grate.
Subclass:
201
This subclass is indented under subclass 195. Devices in
which the water tubes are provided with internal fire tubes
located in the combustion chamber beneath the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
267 for internal fire tubes within the water tubes.
Subclass:
202
This subclass is indented under subclass 195. Devices having
a water tube heating circuit provided with some form of
sediment trap in the circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 398 and 404, for analogous art.
Subclass:
203
This subclass is indented under subclass 195. Devices having
a down-draft water grate located beneath the boiler.
Subclass:
204
This subclass is indented under subclass 195. Devices
provided with a plurality of fireboxes having fuel grates, at
least one of which is a water-cooled grate, so arranged that
the products of combustion from the fireboxes meet each
other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
67 and 287, for analogous art.
Subclass:
205
This subclass is indented under subclass 195. Devices having
a plurality of fire grates, one or more of which are of the
water tube type and so arranged that the products of
combustion from one grate pass over or through the other
grate.
Subclass:
206
This subclass is indented under subclass 195. Devices having
a fuel grate consisting of solid bars and water-cooled bars
combined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
375 and 377, for grate structure.
Subclass:
207
This subclass is indented under subclass 195. Devices having
an updraft water grate located beneath the boiler.
Subclass:
208
This subclass is indented under the class definition.
Boilers comprising flat plates provided with zigzag passages
heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
356 for zigzag water tube boilers heated by fluid fuel.
Subclass:
209.1
SECTIONAL:
This subclass is indented under the class definition.
Boilers made of separate parts generally formed of cast metal
sections and not otherwise classifiable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
44 135+ and 235+, for sectional water tube boilers having
fire tubes, flues or water tubes.
Subclass:
209.2
Feeding air:
This subclass is indented under subclass 209.1. Devices
wherein tubes are provided to admit outside air and allow the
escape of this air into the fire box once heated.
Subclass:
210
This subclass is indented under subclass 209. Sectional
boilers heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 for miscellaneous boilers heated by fluid fuel.
211 for sectional boilers heated by either solid or fluid
fuel.
Subclass:
211
This subclass is indented under subclass 209. Sectional
boilers heated by either solid or fluid fuel or both
combined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
16.1 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a solid fuel burner.
22 for a residual solid or liquid fueled boiler.
Subclass:
212.1
With magazine:
Sectional boilers under subclasses 209.1 having a fuel
storage area.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30 for miscellaneous magazine boilers and see the notes
thereunder for subclasses of boilers with magazines.
Subclass:
212.2
With return or alternate flue:
This subclass is indented under subclass 212.1. Devices
wherein a substitute or return flue is provided to preheat
air for combustion.
Subclass:
213
This subclass is indented under subclass 209. Sectional
boilers having a plurality of fireboxes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
232 for sectional boilers having a water grate above the
main grate for supporting waste material.
Subclass:
214
This subclass is indented under subclass 209. Sectional
boilers whose sections are superimposed and lie substantially
in a horizontal plane.
Subclass:
215
This subclass is indented under subclass 214. Devices the
sections being in communication with one another at their
centers.
Subclass:
216
This subclass is indented under subclass 215. Devices heated
by fluid fuel.
Subclass:
217
This subclass is indented under subclass 215. Devices with a
water firebox.
Subclass:
218
This subclass is indented under subclass 214. Devices with a
water firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
217 for horizontal sections centrally connected with a water
firebox.
Subclass:
219
This subclass is indented under subclass 218. Devices having
a central fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
212 for miscellaneous sectional boilers with fuel
magazines.
Subclass:
220
This subclass is indented under subclass 214. Devices having
water tubes provided with internal fire tubes, with a water
firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
266 for water tube boilers having internal fire tubes.
Subclass:
221
This subclass is indented under subclass 209. Sectional
boilers having vertically disposed sections around the
combustion chamber.
Subclass:
222
This subclass is indented under subclass 221. Devices with a
centrally disposed fuel magazine.
Subclass:
223
This subclass is indented under subclass 209. Sectional
boilers having vertical sections extending longitudinally of
the boiler.
Subclass:
224
This subclass is indented under subclass 223. Devices,
having an inclosing casing spaced apart from the sections to
allow passage for the products of combustion around the
sections.
Subclass:
225
This subclass is indented under subclass 209. Sectional
boilers having sections vertically placed transversely of the
boiler. A plane cutting the section and lying therein would
be vertical and at right angles to the general course of the
products of combustion.
Subclass:
226
This subclass is indented under subclass 225. Devices with
an inclosing casing, so that the products of combustion come
into contact with the outer edges of the sections.
SEE OR SEARCH THIS CLASS, SUBCLASS:
345 for similar art in water tube boilers.
Subclass:
227
This subclass is indented under subclass 226. Devices having
two-part vertical sections transversely arranged, with a
casing around the sections and spaced therefrom.
Subclass:
228
This subclass is indented under subclass 225. Devices whose
sections are made in two parts.
SEE OR SEARCH THIS CLASS, SUBCLASS:
227 for boilers of this type having an inclosing casing.
Subclass:
229
This subclass is indented under subclass 225. Devices
provided with a water grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
232 for miscellaneous sectional boilers with water grates.
Subclass:
230
This subclass is indented under subclass 209. Sectional
boilers consisting of only two vertical sections.
Subclass:
231
This subclass is indented under subclass 209. Subject matter
relating to specific parts, such as joints, fireboxes,
ashpits, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
360 for headers.
511 and the search notes thereunder, for tubes and
connections.
Subclass:
232
This subclass is indented under subclass 209. Sectional
boilers having a water grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
229 for vertical sectional boilers having a water grate.
371 for miscellaneous boilers with water grates, and see the
the list of subclasses thereunder of boilers with water
grates.
Subclass:
233
This subclass is indented under the class definition.
Boilers consisting of a horizontally disposed closed chamber.
Includes the combination of such a closed chamber with the
furnace walls.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13.01-19.2, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.).
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclasses 361.1-363.1 for a boiler
receiving hot liquid or steam from a stove or furnace (e.g.,
kitchen boiler, range boiler, etc.).
220, Receptacles, subclass 567.3 for a stationary tank for a
hot water heater or boiler.
Subclass:
234
This subclass is indented under the class definition.
Boilers consisting of a closed chamber vertically disposed,
in combination with means for heating it.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13.01-19.2, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.).
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclasses 361.1-363.1 for a boiler
receiving hot liquid or steam from a stove or furnace (e.g.,
kitchen boiler, range boiler, etc.).
220, Receptacles, subclass 567.3 for a stationary tank for a
hot water heater or boiler.
Subclass:
235.11
WATER TUBE:
This subclass is indented under the class definition.
Boilers whose heating surface consists substantially of
tubes, through which the water circulates or passes while
being heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11 for rotary water tube boilers.
18.4 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a fluid fueled burner for a water tube
surrounded by the burned fuel.
42 476 and 477, for combined fire and water tube boilers of a
miscellaneous character.
53 68+, 77, 94.1, 99, 100, 102 to 105, 113, and 130+, for
fire tube boilers with water tubes.
138 140+, 153, and 166+, for flue boilers with water tubes.
195 for water tubes in horizontal cylinder boilers.
459 for water tube boilers with superheaters.
SEE OR SEARCH CLASS:
110, Furnaces, 322 for baffles and heat retainers in water
tube boilers.
Subclass:
235.12
Wall structure:
This subclass is indented under subclass 235.11. Devices
having specific wall structure of the water tubes.
Subclass:
235.13
With fuel burners having posts and tuyeres:
This subclass is indented under subclass 235.11. Devices
having specific structure of the combustor, pipe, nozzle or
opening through which air is forced to facilitate
combustion.
Subclass:
235.14
Tube structure:
This subclass is indented under subclass 235.11. Devices
having specific tube structure.
Subclass:
235.15
Headers and connections:
This subclass is indented under subclass 235.11. Devices
having specific structure to the joint where multiple tubes
come together.
Subclass:
235.16
For plural fluids:
This subclass is indented under subclass 235.11. Devices
having multiple fluids which are heated in the boiler.
Subclass:
235.17
Having baffles:
This subclass is indented under subclass 235.11. Devices
having a static structure to control the fluid flow in the
water tubes.
Subclass:
235.18
Having seals:
This subclass is indented under subclass 235.11. Devices
having means to make the water tubes vapor tight.
Subclass:
235.19
D-type tube:
This subclass is indented under subclass 235.11. Devices
wherein the water tubes are shaped in a square loop pattern.
Subclass:
235.21
Multiple D-type tubes:
This subclass is indented under subclass 235.19. Devices
wherein the water tubes have plural squared patterns.
Subclass:
235.22
Wall loop:
This subclass is indented under subclass 235.11. Devices
wherein a plurality of tubes are connected together and
arranged to form at least a portion of the boundary wall of a
gas-tight enclosure.
Subclass:
235.23
Having specific tube patterns:
This subclass is indented under subclass 235.11. Devices
wherein specific arrangements of the tube are provided.
Subclass:
235.24
Screens:
This subclass is indented under subclass 235.11. Devices
wherein the tubes are arranged to form a partition in a
chamber.
Subclass:
235.25
Floor screens:
This subclass is indented under subclass 235.24. Devices
wherein the tubes forming the screen are placed in a lower
section of the chamber.
Subclass:
235.26
Having slag and ash disposal:
This subclass is indented under subclass 235.11. Devices
having means to remove left over products of combustion.
Subclass:
235.27
Locomotive-type:
This subclass is indented under subclass 235.11. Devices
wherein the water tubes are used in a railroad engine.
Subclass:
235.28
Having rotary flame:
This subclass is indented under subclass 235.11. Devices
wherein the burners are angularly spaced apart and all the
jet axes of the burners are tangential to a vertical
imaginary cylinder.
Subclass:
235.29
Having forced circulation system:
This subclass is indented under subclass 235.11. Devices
wherein a means other than convection is used to move a fluid
through the tube.
Subclass:
235.31
Having specific internal drum and head structure:
This subclass is indented under subclass 235.11. Device
wherein there is specific structure to the steam drum and
central connection for the fluid circulation system.
Subclass:
235.32
With combustion:
This subclass is indented under subclass 235.11. Devices
wherein there are specific conditions for burning the fuel.
Subclass:
235.33
With convection zone regulation:
This subclass is indented under subclass 235.11. Devices
wherein means are provided to control the flow of combustion
gases.
Subclass:
235.34
With parallel multiple fireboxes:
This subclass is indented under subclass 235.11. Devices
wherein a plurality of combustion chambers are arranged
symmetrically around a central core.
Subclass:
235.35
With serial multiple fireboxes:
This subclass is indented under subclass 235.11. Devices
wherein a plurality of combustion chambers are arranged in
succession.
Subclass:
236
This subclass is indented under subclass 235. Water tube
boilers heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 and see the note therewith for all subclasses for boilers
heated by fluid fuel.
Subclass:
237
This subclass is indented under subclass 235. Water tube
boilers provided with fuel magazines, not otherwise
classifiable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30 and see the note therewith for all subclasses for boilers
having magazines.
251 272, 310, 320, 334, 339, and 344, for water tube boilers
with a fuel magazine.
Subclass:
238
This subclass is indented under subclass 235. Water tube
boilers having a firebox offset from the main part of the
boiler structure that do not fall within the definitions of
the other subclasses of water tube boilers having an offset
firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
93 94, 120, 175, 189, 190, 209, and 213, for other types of
boilers provided with offset fireboxes.
336 337 and 352, for other types of water tube boilers with
offset fireboxes.
Subclass:
239
This subclass is indented under subclass 235. Water tube
boilers having a plurality of superimposed fireboxes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2 25, 67, 204, 205, 214, 240, and 372, for boilers with
fireboxes or fluid fuel burners superimposed one above the
other.
Subclass:
240.1
Having plural fireboxes:
Water tube boilers under subclasses 235.11+ having multiple
fireboxes not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23 for other types of fluid-fuel burners.
25 for boilers heated by a plurality of superimposed
fluid-fuel burners.
53 138, 204, and 205, for other types of boilers having water
tubes and a plurality of fireboxes.
287 294, 304, and 330, for water tube boilers of various
types with plural fireboxes.
Subclass:
240.2
Series-connected:
This subclass is indented under subclass 240.1. Devices
wherein the multiple fireboxes are connected end to end in a
sequence.
Subclass:
240.3
Parallel connected:
This subclass is indented under subclass 240.1. Devices
wherein the multiple fireboxes are connected inlet to inlet
and outlet to outlet.
Subclass:
241
This subclass is indented under subclass 235. Water tube
boilers having a drum, within which the firebox is located.
SEE OR SEARCH THIS CLASS, SUBCLASS:
50 and 80, for analogous art.
Subclass:
242
This subclass is indented under subclass 235. Devices whose
tube passages have an extremely small cross-sectional area as
compared with their length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 for boilers whose water is heated by passing over the
heating surface in a thin film.
40 for similar structure in flasher types boilers.
260 for flat-tube boilers.
501 for water tubes containing a displacing element, that
renders the tube similar in action to a capillary tube.
Subclass:
243
This subclass is indented under subclass 242. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
348 for vertical water tube boilers having internal fire
tubes.
Subclass:
244
This subclass is indented under subclass 235. Water tube
boilers comprising a vertical stand pipe, around which
extends coils or loops of tubes in either direct or indirect
communication with the stand pipe.
SEE OR SEARCH THIS CLASS, SUBCLASS:
132 for vertical fire tube boilers provided with radial
loops.
133 for vertical fire tube boilers provided with radial
spurs.
169 for similar structure located within a vertical flue.
185 for vertical stand pipes provided with radial loops
located in a vertical flue.
186 for stand pipes provided with radial spur tubes located
within a vertical flue.
245 and 246, for analogous art.
281 for stand pipes provided with loops over a firebox.
307 for central standpipes provided with spur tubes.
323 for miscellaneous water tube boilers with central stand
pipes.
Subclass:
245
This subclass is indented under subclass 244. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
283 for analogous art.
322 for miscellaneous central stand pipe water tube boilers
heated by fluid fuel.
Subclass:
246
This subclass is indented under subclass 244. Devices
extending below the grate and forming an annular firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
184 for a stand pipe, provided with water tubes located in a
vertical flue boiler and having an annular firebox.
335 for miscellaneous water tube boilers with an annular
firebox.
Subclass:
247
This subclass is indented under subclass 235. Water tube
boilers provided with coils of tubes not coming within the
definitions of other subclasses covering water tube boilers
of the coil type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
169 for vertical coiled water tubes located within a
vertical flue.
244 248 and 249+, for various types of coil tube boilers.
355 for analogous water tube boilers incorrectly said to be
coil boilers.
Subclass:
248
This subclass is indented under subclass 247. Devices heated
by a fluid fuel burner, the axes of the coils being
horizontal.
Subclass:
249
This subclass is indented under subclass 247. Devices, the
axes of the coils being vertical.
SEE OR SEARCH THIS CLASS, SUBCLASS:
183 for flues with spiral water conduit.
Subclass:
250
This subclass is indented under subclass 249. Devices heated
by fluid fuel.
Subclass:
251
This subclass is indented under subclass 249. Devices having
a central fuel magazine.
Subclass:
252
This subclass is indented under subclass 249. Devices
provided with a water firebox.
Subclass:
253
This subclass is indented under subclass 235. Water tube
boilers whose tubes are so arranged as to cross one another
and includes cross tube boilers that are not specially
provided for by other subclass definitions.
(1) Note. There is a close analogy between the cross loop
type and the zigzag and the cross tube type of water tube
boilers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99 for water tubes straddling the fuel chamber.
145 146, 147, 176, 177, 253-257, 278, 311, 326, and 329, for
different types of boilers provided with cross water tubes.
355 for zigzag tubes.
Subclass:
254
This subclass is indented under subclass 253. Devices
inclined in opposite directions over the bridge wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
277 for loop tubes over the bridge wall.
Subclass:
255
This subclass is indented under subclass 253. Devices in
which the tubes are over the firebox, inclined in opposite
directions longitudinally of the boiler and each bank of
tubes being in communication with headers at each end, which
headers are in turn in either direct or indirect
communication with one or more drums.
Subclass:
256
This subclass is indented under subclass 253. Devices, each
bank of tubes being in communication with headers at each
end, which in turn are in communication with a drum above the
tubes.
Subclass:
257
This subclass is indented under subclass 253. Devices in
which the tubes cross each other transversely of the boiler,
each tube being in communication with headers at each end,
which headers are in either direct or indirect communication
with a drum located above the water tubes.
Subclass:
258
This subclass is indented under subclass 235. Water tube
boilers provided with means for causing a downward flow of
water in the tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 for analogously operating boilers.
209 and 218, for sectional boilers with a down flow of water
through the sections.
Subclass:
259
This subclass is indented under subclass 235. Boilers
composed of very large tubes or drums.
Subclass:
260
This subclass is indented under subclass 235. Water tube
boilers having flat tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39 for film type boilers.
40 for flasher boilers.
242 for capillary tubes.
Subclass:
261
This subclass is indented under subclass 260. Devices in
which the tubes are coiled about a central axis, each winding
being spaced apart.
SEE OR SEARCH THIS CLASS, SUBCLASS:
134 for volute fire tube boilers.
Subclass:
262
This subclass is indented under subclass 235. Water tube
boilers that are horizontal and do not fall within the
definitions of other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
102 for horizontal fire tube boilers having horizontal water
tubes over the bridge wall.
197 201, and 203 to 207, for horizontal cylindrical boilers
provided with horizontal water tubes.
236 for horizontal water tube boilers heated by fluid fuel,
except the zigzag type noted in the other notes.
267 for horizontal tubes provided with internal fire tubes.
279 for horizontally disposed looped tubes.
285 286, 287, 289, and 354, for horizontal water tube boilers
with water grates.
316 for horizontal spur tubes over the firebox.
353 for water tube water grates.
Subclass:
263
This subclass is indented under subclass 262. Devices in
which the tubes are over the bridge wall.
Subclass:
264
This subclass is indented under subclass 262. Devices in
which the tubes are disposed over the firebox.
Subclass:
265
This subclass is indented under subclass 235. Water tube
boilers not otherwise classifiable having water tubes
inclined from a vertical or a horizontal line.
SEE OR SEARCH THIS CLASS, SUBCLASS:
266 275+, 290+, 305+, 324+, and 355+, for more specifically
associated inclined water tubes.
Subclass:
266
This subclass is indented under subclass 235. Water-tube
boilers provided with water tubes within which there is a
fire tube forming an annular water space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
242 for capillary tubes constructed in this manner.
348 for vertical water tubes having internal fire tubes.
Subclass:
267
This subclass is indented under subclass 266. Devices whose
water tubes are horizontally disposed.
Subclass:
268
This subclass is indented under subclass 266. Devices whose
water tubes are inclined.
SEE OR SEARCH THIS CLASS, SUBCLASS:
269 for plural fire tubes within the water tubes.
270 for the tubes placed over a firebox.
Subclass:
269
This subclass is indented under subclass 266. Devices whose
water tubes have a plurality of fire tubes within them.
Subclass:
270
This subclass is indented under subclass 266. Devices
inclined toward each other over the combustion chamber or
firebox. The tubes are generally provided with headers at
top and bottom, and the headers may be in communication with
drums extending longitudinally of the boiler.
Subclass:
271
This subclass is indented under subclass 266. Devices whose
tubes are in a substantially vertical position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
348 for that type of boiler heated by fluid fuel.
Subclass:
272
This subclass is indented under subclass 271. Devices having
a centrally disposed fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
339 for vertical water tube boilers provided with a
centrally disposed fuel magazine when the water tubes do not
contain fire tubes.
Subclass:
273
This subclass is indented under subclass 235. Water tube
boilers having an upper longitudinal drum with miscellaneous
types of water tubes communicating therewith not provided for
in the definitions of other water tube boiler subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
275 for similar structure in looped water tube boilers.
291 298, 312, 346, 347, 351, and 357, for more specifically
associated longitudinal upper drums.
324 for similar structure in straddle tube boilers.
Subclass:
274
This subclass is indented under subclass 273. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
250 283, 328, 348, and 356, for analogous art.
331 for transverse horizontal drum boilers.
Subclass:
275
This subclass is indented under subclass 235. Miscellaneous
water tube boilers whose tubes are in the form of loops.
SEE OR SEARCH THIS CLASS, SUBCLASS:
132 and 185, for other types of boilers provided with looped
water tubes.
244 for boilers of the water tube type having either looped
or coiled tubes or both combined.
355 for analogous structure.
Subclass:
276
This subclass is indented under subclass 275. Devices having
a firebox located within the loops.
Subclass:
277
This subclass is indented under subclass 275. Devices in
which the loops extend over the bridge wall.
Subclass:
278
This subclass is indented under subclass 275. Devices in
which the loops cross each other over the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
311 for crossed spur water tubes over the firebox.
355 for crossed zigzag tubes.
Subclass:
279
This subclass is indented under subclass 275. Devices in
which the loops extend over the firebox, their axes being
substantially horizontal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
316 for similar boilers whose tubes are of the spur type.
Subclass:
280
This subclass is indented under subclass 275. Devices having
one or more headers vertically posited at the bridge wall,
and in which the looped tubes extend over and in rear of the
firebox or only in the rear thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
306 for similarly constructed water tube boilers provided
with spur tubes.
Subclass:
281
This subclass is indented under subclass 275. Devices having
a stand pipe with the looped tubes over the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
132 for vertical fire tube boilers provided with looped
water tubes.
185 for vertical flue boilers having a looped tube stand
pipe.
244 308 and 309, for spur tube boilers having a stand pipe,
with tubes over the firebox.
Subclass:
282
This subclass is indented under subclass 275. Devices in
which the looped tubes are over the firebox, their axis and
plane being substantially vertical.
SEE OR SEARCH THIS CLASS, SUBCLASS:
318 for vertical spur tubes.
359 for zigzag tubes.
Subclass:
283
This subclass is indented under subclass 282. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
319 for similar boilers having spur tubes.
356 for similar devices having zigzag tubes.
Subclass:
284
This subclass is indented under subclass 235. Water tube
boilers having water tubes extending over the bridge wall and
in communication with headers at each end, which are
substantially at right angles to each other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
288 for similar structure over a firebox.
Subclass:
285
This subclass is indented under subclass 235. Water tube
boilers having banks of water tubes substantially parallel
extending over the bridge wall and having a transverse water
baffle for the products of combustion.
SEE OR SEARCH THIS CLASS, SUBCLASS:
280 and 306, for analogous art.
293 for water tube boilers with longitudinal water baffles
between the tubes.
Subclass:
286
This subclass is indented under subclass 235. Water tube
boilers having water tubes extending over the bridge wall and
provided with a downdraft water grate.
Subclass:
287
This subclass is indented under subclass 235. Water tube
boilers having water tubes extending over the bridge wall and
a plurality of fireboxes, the products of combustion from one
firebox meeting those from the other firebox and the fuel
grate of at least one firebox being of the water grate type.
The firebox with the water grate is generally located above
the other firebox and the draft is down through the water
grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
67 and 204, for other types of boilers having intermediate
draft water grates.
Subclass:
288
This subclass is indented under subclass 235. Water tube
boilers having water tubes located over the firebox and
communicating with headers at each end at right angles with
each other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
284 for similar art.
Subclass:
289
This subclass is indented under subclass 235. Water tube
boilers having water tubes over the firebox and with an
updraft water grate.
Subclass:
290
This subclass is indented under subclass 235. Water tube
boilers having banks of water tubes rearwardly declined over
the bridge wall and being in communication with a front
header or drum and a rear header or drum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
265 297, 331, and 474, for analogous structure.
Subclass:
291
This subclass is indented under subclass 290. Devices in
which the drums are horizontally and longitudinally posited
and are elevated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
104 268, 295, 472, and 473, for allied art.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 98 for baffles in furnaces of water
tube boilers.
Subclass:
292
This subclass is indented under subclass 291. Devices having
heating tubes extending over, through, or around the firebox,
forming distinct circulation and heating conduits from the
main banks of tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
407 for injector type circulation means.
Subclass:
293
This subclass is indented under subclass 291. Devices having
water baffles extending longitudinally of the water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
285 for transverse baffles over the bridge wall.
Subclass:
294
This subclass is indented under subclass 291. Devices,
provided with water walls on two or more sides of the
combustion chamber, consisting of metal sheets spaced apart
or formed of water tubes. There may or may not be cross
water tubes extending through the combustion chamber.
Subclass:
295
This subclass is indented under subclass 290. Devices in
which the tubes have within them and spaced therefrom smaller
tubes communicating with separate compartments of the
headers, and such tubes not being of the spur tube or "Field"
tube type. These headers may be in communication with
longitudinally or transversely disposed drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
305 for spur tubes.
474 for super heaters for water tube boilers having banks of
tubes over the bridge wall.
Subclass:
296
This subclass is indented under subclass 290. Devices in
which the front and rear headers are in either direct or
indirect communication with one or more drums substantially
parallel with the tubes and rearwardly declined
longitudinally of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
471 for superheaters of similar construction.
Subclass:
297
This subclass is indented under subclass 290. Devices in
which the front and rear headers are in communication, either
directly or indirectly, with one or more transverse drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
277 for devices in which the water tubes are in the form of
loops extending over the bridge wall.
331 for other heater tube boilers having transverse
horizontal drums.
478 for super heaters having transverse drums.
Subclass:
298
This subclass is indented under subclass 235. Devices having
banks of water tubes declined rearwardly over the firebox, in
communication with front and rear headers, which are in turn
in communication, directly or indirectly, with one or more
horizontally and longitudinally fixedly positioned drums
above the tubes.
Subclass:
299
This subclass is indented under subclass 235. Devices having
banks of water tubes substantially parallel, rearwardly
declined over the firebox, and in communication with front
and rear headers, which are in turn either directly or
indirectly in communication with one or more transversely
fixedly positioned drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
265 for water tube boilers in which the tubes are inclined.
Subclass:
300
This subclass is indented under subclass 235. Devices
consisting of banks of water tubes rearwardly declined over
the firebox and in communication with front and rear headers,
which may also be in communication with some form of drums
above the tubes, and also having banks of tubes beyond side
walls of the main combustion chamber.
Subclass:
301
This subclass is indented under subclass 235. Devices
consisting of rearwardly declined banks of water tubes in
communication with a plurality of horizontally and
transversely disposed drums, both at the top and at the
bottom of the tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
352 for analogous structures on vertical water tube
boilers.
478 for super heaters having transverse drums.
Subclass:
302
This subclass is indented under subclass 235. Devices
consisting of banks of tubes rearwardly declined and
communicating with a plurality of upper transverse horizontal
drums at the top and with a single transverse horizontal drum
at the bottom, or the tubes may be in communication with a
header at the bottom, which is in turn in communication with
the lower drum.
Subclass:
303
This subclass is indented under subclass 235. Devices having
banks of substantially parallel water tube rearwardly
inclined over the firebox and in communication with front and
rear headers, which are in turn in either direct or indirect
communication with one or more transversely fixedly
positioned drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
265 for water tube boilers in which the tubes are inclined.
Subclass:
304
This subclass is indented under subclass 235. Devices
provided with separate banks of water tubes over separate
fireboxes disposed on opposite sides of the unitary boiler
structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
240 for water tube boilers with a plurality of fireboxes
that do not come within the definition of this subclass.
Subclass:
305
This subclass is indented under subclass 235. Devices having
spur tubes projecting from a drum or equivalent,
communicating therewith at one end and having the other end
closed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 143, 173, 180, 181, 186, 342, and 462, for other boilers
having spur tubes which form some substantial part of the
heating surface.
275 for water tube boilers of similar types having looped
tubes.
Subclass:
306
This subclass is indented under subclass 305. Devices having
a vertical header located at the bridge wall, and in which
the spur tubes extending over the firebox and in rear thereof
or extending in the rear of the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
280 for boilers of similar structure provided with looped
tubes.
Subclass:
307
This subclass is indented under subclass 305. Devices having
a central stand pipe in which the spur tubes are radial.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for vertical fire tube boilers provided with radial spur
tubes.
143 for horizontal flue boilers provided with spur water
tubes internally.
173 for vertical flue boilers provided with internal
horizontal spur tubes.
180 for vertical flue boilers with vertically aligned fire
tubes and having spur water tubes.
181 for vertical flue boilers with vertical spurs.
244 for stand pipes provided with coiled or looped tubes.
281 for stand pipe boilers of the water tube type provided
with radial looped tubes over the firebox.
342 for spur tube drums.
475 for this type of boiler with a superheater.
Subclass:
308
This subclass is indented under subclass 307. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
245 for water tube boilers having a central stand pipe
provided with coiled or looped tubes and heated by fluid
fuel.
281 for water tube boilers having stand pipes provided with
looped tubes.
322 for miscellaneous water tube boilers provided with stand
pipes and heated by fluid fuel.
Subclass:
309
This subclass is indented under subclass 307. Devices in
which the central stand pipe extends below the fire grate,
forming an annular firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
186 for vertical flue boilers with a spur tube stand pipe
and an annular firebox.
246 for boilers of the water tube type provided with a
central stand pipe having coils or loops and an annular
firebox.
323 for miscellaneous water tube boilers with a central
stand pipe and an annular firebox.
Subclass:
310
This subclass is indented under subclass 307. Devices having
a fuel magazine within the stand pipe.
SEE OR SEARCH THIS CLASS, SUBCLASS:
168 for vertical flue boilers with central magazines with
internal water tubes.
Subclass:
311
This subclass is indented under subclass 305. Devices in
which the spur tubes cross each other.
SEE OR SEARCH THIS CLASS, SUBCLASS:
278 for cross looped tubes.
Subclass:
312
This subclass is indented under subclass 305. Devices in
which the drum is horizontal and longitudinal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
195 for horizontal cylindrical water tube boilers.
273 for other boilers having longitudinal drums.
317 for drums provided with spur tubes that straddle the
combustion chamber.
Subclass:
313
This subclass is indented under subclass 305. Devices in
which the spur water tubes extend over the bridge wall.
Subclass:
314
This subclass is indented under subclass 305. Devices in
which the spur tubes are located over the firebox on both
sides of a vertical central header.
SEE OR SEARCH THIS CLASS, SUBCLASS:
319 for water tube boilers having vertical spur water tubes
heated by fluid fuel.
Subclass:
315
This subclass is indented under subclass 305. Devices in
which the spur tubes are declined over the firebox.
Subclass:
316
This subclass is indented under subclass 305. Devices in
which the spur water tubes are horizontally disposed over the
firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
279 for horizontal loop tubes over the firebox.
Subclass:
317
This subclass is indented under subclass 305. Devices in
which the spur water tubes straddle the combustion chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99 and 270, for spur tubes having internal fire tubes
straddling the combustion chamber.
324 for other types of water tube boilers of the straddle
type.
Subclass:
318
This subclass is indented under subclass 305. Devices in
which the spur tubes are vertical.
SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for vertical fire tube boilers with vertical spur
tubes.
181 for vertical flue boilers having vertical spur water
tubes within the flue.
271 for internal fire-tube type water-tube boiler in which
the tubes are vertical.
282 for water tube boilers having vertical looped tubes over
the firebox.
348 for fluid fuel heated internal fire tube type water-tube
boilers in which the tubes are vertical.
Subclass:
319
This subclass is indented under subclass 318. Devices which
are heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
179 283, 333, and 348, for other types of vertical water tube
boilers heated by fluid fuel.
Subclass:
320
This subclass is indented under subclass 318. Devices having
a centrally disposed fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
168 for vertical flue boilers with internal spur tubes.
339 and 344, for other types of water tube boilers with
vertical tubes and a central magazine.
Subclass:
321
This subclass is indented under subclass 235. Devices having
a vertical pipe relatively large in cross section and
provided with some form of water tubes and not otherwise
provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13 for range or kitchen boilers, called in the art "stand
boilers", which are provided with a heater.
132 133, 184, 185, 186, 215+, and 218, for sectional stand
pipe boilers.
281 307+ and 475, for stand pipes provided with spur water
tubes.
Subclass:
322
This subclass is indented under subclass 321. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
216 for sectional stand pipe boilers heated by fluid fuel.
245 for coiled or looped tube boilers with a stand pipe and
heated by fluid fuel.
308 for stand pipes provided with spur water tubes and
heated by fluid fuel.
Subclass:
323
This subclass is indented under subclass 321. Devices in
which the stand pipe extends downwardly below the fire grate,
forming an annular firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
184 246, 309, and 475, for stand pipes provided with spur
tubes having an annular firebox.
Subclass:
324
This subclass is indented under subclass 235. Devices having
water tubes that straddle the combustion chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99 270 and 317, for other types of straddle water tube
boilers.
Subclass:
325
This subclass is indented under subclass 324. Devices in
which the tubes are either in communication with headers at
top and bottom, which are in turn in communication with
separate upper and lower drums, or in communication directly
with separate upper and lower drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
240 for miscellaneous fire tube boilers having a plurality
of fireboxes.
351 for vertical water tube boilers having a plurality of
upper and lower drums.
Subclass:
326
This subclass is indented under subclass 325. Devices having
the tubes cross over the combustion chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
329 for this type of boiler having a single upper drum.
Subclass:
327
This subclass is indented under subclass 324. Devices in
which the water tubes are either in direct communication with
a single upper drum and with a plurality of lower drums or in
direct communication with headers, which are in turn in
communication with the drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99 and 329, for boilers of this type having the tubes
crossing each other.
Subclass:
328
This subclass is indented under subclass 327. Devices heated
by fluid fuel.
Subclass:
329
This subclass is indented under subclass 327. Devices in
which the tubes cross each other.
Subclass:
330
This subclass is indented under subclass 327. Devices having
two or more fireboxes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
240 for miscellaneous water tube boilers having a plurality
of fireboxes.
Subclass:
331
This subclass is indented under subclass 235. Devices having
one or more transverse horizontal drums provided with water
tubes that are not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
255 257, 277, 290, 297, 299, 301, 302, 303, 332, 346, 352,
and 358, for water tube boilers with transverse horizontal
drums.
Subclass:
332
This subclass is indented under subclass 235. Devices having
vertical tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103 171, 198, 199, 247+, 266+, 275+, and 281, for vertical
columns provided with looped tubes extending over the
firebox.
282 305+, for spur tube boilers.
318 355 and 359, for vertical columns surrounding the
combustion chamber, with zigzag water tubes communicating
with the columns.
Subclass:
333
This subclass is indented under subclass 332. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
167 174, 250, 283, 319, and 348, for other boilers heated by
fluid fuel.
Subclass:
334
This subclass is indented under subclass 332. Devices having
a fuel magazine at the side of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
339 and 344, for other types of fuel magazines with vertical
water tube boilers.
373 for analogous art.
Subclass:
335
This subclass is indented under subclass 332. Devices having
an annular or surrounding firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
246 for coiled or looped water tubes around a stand pipe
having an annular firebox.
309 for water tube boilers having a central stand pipe
provided with spur tubes and extending below the fire grate
to form an annular firebox.
Subclass:
336
This subclass is indented under subclass 332. Devices having
an offset firebox exterior of the main boiler structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
175 for other types.
209 for sectional boilers with offset fireboxes.
213 for sectional boilers with plural fireboxes, one of
which may be offset.
221 238 and 352, for other offset fireboxes.
Subclass:
337
This subclass is indented under subclass 336. Devices in
which the offset firebox is at the top of the boiler.
Subclass:
338
This subclass is indented under subclass 332. Devices, in
which the water tubes communicate with the upper and the
lower drums, which are of ring or equivalent form.
Subclass:
339
This subclass is indented under subclass 338. Devices having
a centrally disposed fuel magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
251 320 and 344, for boilers of a similar type having a
central magazine, but whose upper drum is not annular in
form.
Subclass:
340
This subclass is indented under subclass 338. Devices in
which the water tubes are within the space inclosed by the
vertical tubes over the firebox.
Subclass:
341
This subclass is indented under subclass 332. Devices in
which the water tubes communicate with an annular lower drum
and with an upper drum provided with fire tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
342 and 343, for boilers of similar structure, but whose
upper drum is not provided with fire tubes.
Subclass:
342
This subclass is indented under subclass 332. Devices in
which the water tubes communicate with an annular lower drum
and an upper drum provided with spur water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
341 and 343, for boilers of similar structure without the
spur tubes on the upper drum.
Subclass:
343
This subclass is indented under subclass 332. Devices in
which the water tubes communicate with an annular lower drum
and with an upper drum.
Subclass:
344
This subclass is indented under subclass 343. Devices,
having a central magazine.
SEE OR SEARCH THIS CLASS, SUBCLASS:
339 for similar boilers in which the upper drum is annular.
Subclass:
345
This subclass is indented under subclass 332. Devices in
which the vertical water tubes are beyond the bridge wall and
may or may not be around or over the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
226 for analogous art in sectional boilers.
352 for boilers with an offset firebox.
Subclass:
346
This subclass is indented under subclass 345. Devices having
vertical water tubes beyond the bridge wall and above the
firebox, with any type of drums or headers communicating with
the tubes and so arranged that the products of combustion
pass over the bridge wall and upwardly through a separate
passage to the front of the boiler before they are
discharged.
SEE OR SEARCH THIS CLASS, SUBCLASS:
350 for similar art where there are boilers with vertical
tubes wholly over the firebox and having the products of
combustion pass out at one end of the firebox and return
through the vertical tubes above the firebox.
Subclass:
347
This subclass is indented under subclass 345. Devices having
vertical water tubes in the rear of the bridge wall and
communicating with a longitudinal upper and a longitudinal
lower drum. There may or may not be water tubes above the
firebox, but the products of combustion do not return.
SEE OR SEARCH THIS CLASS, SUBCLASS:
346 for vertical water tube boilers having horizontal
longitudinal upper and lower drums where the products of
combustion pass also rearwardly through the tubes.
444 for miscellaneous combinations of means for heating the
feed water in a water tube boiler either outside or inside
the water space of the boiler.
Subclass:
348
This subclass is indented under subclass 332. Devices in
which the vertical water tubes are provided with internal
fire tubes and heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
174 for vertical flue boilers having vertical water tubes
provided with internal fire tubes.
243 and 271, for vertical water tube boilers provided with
internal fire tubes and heated by solid fuel.
Subclass:
349
This subclass is indented under subclass 332. Devices in
which the vertical water tubes communicate with drums or
headers and are located over the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
282 for water tube boilers having looped tubes over the
firebox, the axis and plane of the loop being substantially
vertical.
318 for water tube boilers having vertical spur tubes.
333 for boilers with vertical water tubes heated by fluid
fuel.
Subclass:
350
This subclass is indented under subclass 349. Devices in
which the products of combustion pass out of the firebox at
the rear and return over the firebox between the water
tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
346 for such devices in which the water tubes are located
beyond the bridge wall and above the firebox and arranged so
that the products of combustion pass over the bridge wall and
upwardly through a separate passage to the front of the
boiler before they are discharged.
Subclass:
351
This subclass is indented under subclass 332. Devices in
which the vertical water tubes are in communication with a
plurality of horizontally and longitudinally posited upper
and lower drums forming a plurality of fireboxes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
240 for water tube boilers having a plurality of fireboxes
not otherwise provided for.
Subclass:
352
This subclass is indented under subclass 332. Devices having
a plurality of upper transverse drums and a plurality of
lower transverse drums with vertical water tubes connecting
the upper and lower drums and with a firebox offset from the
main boiler structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
238 301 and 336, for analogous art.
Subclass:
353
This subclass is indented under subclass 235. Devices with
water grates that are not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
286 287, 289, and 354, for other water tube boilers with
water grates.
Subclass:
354
This subclass is indented under subclass 353. Devices having
downdraft water grates.
Subclass:
355
This subclass is indented under subclass 235. Devices having
the water tubes so arranged that the water passes back and
forth in a zigzag manner through the tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
247 and 258, for zigzag tubes where the water flows
downwardly through the tubes.
275 for looped tube boilers where the water flows through
one tube and back through another.
305 for spur tube boilers provided with an internal tube or
partition, so that the water will flow out and back through
the same tube.
Subclass:
356
This subclass is indented under subclass 355. Devices heated
by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
208 for plate boilers with zigzag conduits.
250 for vertical coil water tube boilers heated by fluid
fuel.
Subclass:
357
This subclass is indented under subclass 355. Devices having
a longitudinally posited drum above the tubes, which extend
in a zigzag manner over the bridge wall.
SEE OR SEARCH THIS CLASS, SUBCLASS:
273 for other types of water tube boilers having a
longitudinal drum.
Subclass:
358
This subclass is indented under subclass 355. Devices having
water tubes that extend over the bridge wall in a zigzag
manner and in communication with one or more transversely
posited drums.
SEE OR SEARCH THIS CLASS, SUBCLASS:
331 for other types of water tube boilers having
transversely posited drums.
Subclass:
359
This subclass is indented under subclass 355. Devices whose
tubes are located over the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
249 and 258, for zigzag boilers having tubes over the
firebox when the flow of fluid is in a downward direction.
356 for zigzag boilers heated by fluid fuel.
Subclass:
360
This subclass is indented under subclass 235. Devices
involving the structure of headers for water tube boilers;
also includes the coupling connection between the headers and
water tubes and the closures for the hand holes in the
headers when the form of the header is involved in the
claims.
SEE OR SEARCH THIS CLASS, SUBCLASS:
511 for boiler tubes, flues and connections not provided for
elsewhere.
SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, for structure of boiler
tubes, per se, particularly subclass 95 for return bend
closures.
220, Receptacles, 200 for manholes and closures of general
application, whether applied to a boiler or boiler header,
where the structure of the boiler or header is not involved.
285, Pipe Joints or Couplings, 189 for couplings and unions
between a tube and plate of general application.
Subclass:
361
This subclass is indented under subclass 360. Subject matter
comprising the structure of the header, with its connections,
when formed for the purpose of cleaning the header or boiler
tubes, either inside or outside.
SEE OR SEARCH THIS CLASS, SUBCLASS:
379 for the general apparatus for cleaning boilers of the
kind classified in class 122.
Subclass:
362
This subclass is indented under subclass 360. Subject matter
comprising the structure of the header and tube connections
of specific application for a water tube boiler when two
tubes concentrically arranged are coupled to a header.
SEE OR SEARCH CLASS:
159, Concentrating Evaporators.
Subclass:
363
This subclass is indented under subclass 360. Subject matter
comprising the structure of headers of the drum type and tube
connections therefor and closures for the drum hand holes
when the drum structure is involved.
SEE OR SEARCH THIS CLASS, SUBCLASS:
365 for general structure of drums for water tube boilers.
393 for the structure of mud drums and modifications in
boilers for their application.
SEE OR SEARCH CLASS:
220, Receptacles, 200 for closures of general application.
Subclass:
364
This subclass is indented under subclass 360. Subject matter
comprising headers and tubes provided with valves for closing
the flow of water through the tubes or headers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
507 for automatically closed valves classified in Class
122.
SEE OR SEARCH CLASS:
138, Pipes and Tubular Conduits, 89 for pipe closures.
220, Receptacles, 200 for closures of general application.
Subclass:
365
This subclass is indented under subclass 235. Subject matter
comprising the structure of drums and couplings and unions
between the drum and the header or the drum and the water
tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
192 for drums.
363 for headers of drum form.
393 for structure of mud drums unless of general
application.
434 for special combinations of drums and feed water
heaters.
511 and 512, for couplings of specific form for boilers.
Subclass:
366
This subclass is indented under the class definition.
Boilers provided with an absorbent wick within the fluid
chamber for raising water from one part of the chamber to
another to increase the generation of vapor.
SEE OR SEARCH CLASS:
428, Stock Material or Miscellaneous Articles, 357 for a
strand with structure and not provided for in any other
class.
Subclass:
367.1
HEAT TRANSMITTER:
This subclass is indented under the class definition.
Boilers with some special heat transmitting structure not
otherwise classifiable. Most of these devices include tubes
or boiler walls provided with flanges or heat conducting
pins.
SEE OR SEARCH CLASS:
165, Heat Exchange, subclass 179 for a tube having heat
transmitters penetrating the tube wall, and subclass 185 for
a heat transmitter of more general application.
Subclass:
367.2
Double immersed heat transmitters:
Devices under subclasses 367.1 wherein the heat transmitting
tubes have an inner shell and an outer shell both of which
transfer heat to a fluid.
Subclass:
367.3
Corrugated and finned heat transmitters:
This subclass is indented under subclass 367.1. Devices
wherein the heat transmitting tubes have projecting vanes or
a series of parallel and alternating ridges and grooves.
Subclass:
367.4
Pebble furnaces:
This subclass is indented under subclass 367.1. Devices
wherein the heat transmitting tube contains granular material
to hold the heat.
Subclass:
368
This subclass is indented under the class definition.
Boilers not otherwise classifiable having water fireboxes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2 for garbage burning plants disclosing boilers with water
fireboxes.
8 for industrial furnaces having water fireboxes.
16.1 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a solid fuel burner that may include a
water-jacketed firebox.
44 for fire tube boilers.
135 for most of the patents for boilers with water
fireboxes, but claiming or disclosing more than a water
firebox.
189 190, 193+, for horizontal cylindrical boilers with water
fireboxes.
209 for boilers made of separate parts.
235 for special combinations of water fireboxes with water
tube boilers, and especially subclasses 241 and 252, for
water fireboxes.
Subclass:
369
This subclass is indented under subclass 368. Subject matter
comprising the construction of the lower part of a water
firebox and mud ring or spacing member forming the bottom of
the water walls.
SEE OR SEARCH THIS CLASS, SUBCLASS:
385 for boilers provided with an internal conduit located
within the water firebox above the mud ring.
Subclass:
370
This subclass is indented under subclass 368. Subject matter
comprising miscellaneous water firebox boilers having a
plurality of water fireboxes not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57 60, 95, 96, 213, 229, 372, for other types of water
firebox boilers having a plurality of water fireboxes.
Subclass:
371
This subclass is indented under the class definition.
Boilers having water grates that do not come within the
definitions of other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2 5, 66, 67, 97, 98, 129, 152, 203-207, 229, 232, 286, 287,
289, 321, 323, 353, 354, for other water grates.
SEE OR SEARCH CLASS:
110, Furnaces, 267 for progressive feed, and subclasses 298+
for hollow air-cooled grates.
126, Stoves and Furnaces, 152 for other stove and furnace
grates.
Subclass:
372
This subclass is indented under subclass 371. Subject matter
comprising boilers not otherwise classified having
superimposed fireboxes with at least one of the fuel grates
of the water grate type. This type of boilers is generally
used for the burning of garbage or other waste material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2 for garbage plants having water grate boilers of this
type.
207 232, 353, for water tube boilers with superposed updraft
water grates.
Subclass:
373
This subclass is indented under subclass 371. Devices having
a water grate of cage-like or basket-like structure.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 294 for furnaces with a magazine the
lower part of which has perforations or bars on opposite
sides, the air entering on one side and the flame passing out
on the other side.
126, Stoves and Furnaces, 513 for fireplace heaters that are
provided with water or steam generating backs and designed to
be connected up to heat radiators in distant rooms.
Subclass:
374
This subclass is indented under subclass 371. Subject matter
comprising the structure of water grates themselves except
the cage grate type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
321 for water tube boilers having a vertical pipe relatively
large in cross section and provided with some form of water
tubes and not otherwise provided for.
373 375, for other water grate structures.
Subclass:
375
This subclass is indented under subclass 374. Devices having
both solid and water bars.
SEE OR SEARCH THIS CLASS, SUBCLASS:
206 for horizontal cylindrical boilers with this type of
grate.
374 for the structure of water grates except those of the
cage grate type.
Subclass:
376
This subclass is indented under subclass 371. Devices having
a water-cooled progressive fuel feeding grate having means
for moving the fuel along the grate.
Subclass:
377
This subclass is indented under subclass 371. Devices not
otherwise provided for having a water firebox with an updraft
fuel grate composed of both solid bars and water bars.
SEE OR SEARCH THIS CLASS, SUBCLASS:
206 213, 229, 353, for other boilers with this type of water
grate.
375 for the grate structure of this type of grate.
Subclass:
378
This subclass is indented under subclass 371. Devices not
otherwise provided for having a water firebox with an updraft
water grate.
SEE OR SEARCH THIS CLASS, SUBCLASS:
98 229, 232, 289, 353, for other boilers with water grate
structure.
Subclass:
379
This subclass is indented under the class definition.
Devices comprising boilers provided with mechanism for
cleaning the boiler or purifying the water while the boiler
is in operation and so united therewith that it remains in
position when the boiler is in operation, or the mechanism is
of such specific application that it is adapted for use with
no other art, and not provided for in other subclasses in
this class. In general, this subclass, and indented
subclasses take cleaning apparatus combined with boiler
structure and cleaning processes combined with steps of
boiler operation, for example, such operations as are
provided for below under the titles "Blow-off" and "Trapped
circuit". It also takes apparatus and processes, per se, for
cleaning boilers not elsewhere provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 for horizontal fire tube boilers with water heating
circulating tubes with a sediment trap.
202 for horizontal cylindrical boilers with water heating
and circulating tubes provided with a sediment trap.
360 for structure of headers for water tube boilers with
hand openings and closures therefor, when the structure of
the header is modified.
361 for headers provided with special boiler cleaning
devices.
364 for headers provided with tube closures.
429 and 433, for feed heaters with automatically operated
valves for reversing the flow of water through the trap when
the blow-off is opened.
431 for feed water heaters with a filter inside the boiler.
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, appropriate
subclasses for cleaning apparatus, which involve at least one
of the following means. A gas blast or vacuum, brushing,
beating, scraping, shaking, wiping, shotting, the use of a
squeegee, with or without detergents.
134, Cleaning and Liquid Contact With Solids, for cleaning
processes and apparatus including the cleaning and/or
pickling of metal.
148, Metal Treatment, appropriate subclasses for metal
cleaning processes (1) of any kind combined with other metal
treating steps.
165, Heat Exchange, subclass 95 for a heat exchanger with
cleaning means.
196, Mineral Oils: Apparatus, subclass 122 for mineral oil
vaporizers provided with means to remove carbon from the oil
or from the vaporizer.
204, Chemistry: Electrical and Wave Energy, subclasses
196.01-196.38 for electrolytic protection apparatus (e.g.,
to keep the surfaces of liquid heaters and vaporizers clean,
etc.).
205, Electrolysis: Processes, Compositions Used Therein, and
Methods of Preparing the Compositions, subclasses 724-740
for processes of electrolytic protection of metal objects
(e.g., to keep the surfaces of liquid heaters or vaporizers
clean, etc.).
208, Mineral Oils: Processes and Products, subclass 48 for
mineral oil conversion processes which include some procedure
for preventing the formation of deleterious carbon
accumulations or removing such accumulations from the
equipment.
210, Liquid Purification or Separation, 175 for a heater in
combination with separating apparatus, especially subclasses
177+ having means to add a treating material.
220, Receptacles, 200 for boiler manholes and closures.
252, Compositions, for boiler compounds or mixtures and
chemicals for introducing into boilers for preventing the
formation of scale or for removing the scale from the boiler
when formed, and processes involving the mere use of the
composition even though the thing or surface treated be
specified.
261, Gas and Liquid Contact Apparatus, for boiler purposes.
Subclass:
380
This subclass is indented under subclass 379. Devices having
mechanically operated agitators or circulators for the water
in the boiler or scrapers so arranged that the sediment will
be carried to the clean-out end of the boiler or mud drum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
411 for mechanical circulating devices within the boiler.
Subclass:
381
This subclass is indented under subclass 379. Devices having
means for blowing off the water both at the surface and at
the bottom.
Subclass:
382
This subclass is indented under subclass 379. Devices
provided with means for blowing off the boiler at the bottom
and removing the sediment.
SEE OR SEARCH THIS CLASS, SUBCLASS:
381 for devices for blowing off the boiler both at the
bottom and the surface of the water.
Subclass:
383
This subclass is indented under subclass 382. Devices having
a conduit extending into the boiler along the bottom, either
fixed or movable, adapted to remove the sediment.
Subclass:
384
This subclass is indented under subclass 383. Devices having
one or more conduits extending along the bottom of the
boiler, provided with a steam ejector.
Subclass:
385
This subclass is indented under subclass 383. Devices
provided with an internal conduit located within the water
firebox above the mud ring.
SEE OR SEARCH THIS CLASS, SUBCLASS:
369 405, for analogous art.
Subclass:
386
This subclass is indented under subclass 383. Devices having
a sediment pan or receptacle at the bottom of the boiler and
provided with a blow-off conduit communicating with the pan.
SEE OR SEARCH THIS CLASS, SUBCLASS:
393 394, for pans without blow-off conduits.
Subclass:
387
This subclass is indented under subclass 383. Devices
provided with scrapers for removing the incrustation or
sediment.
SEE OR SEARCH THIS CLASS, SUBCLASS:
379 for scrapers attached to the boiler, but movable and not
having a blow-off conduit,
384 for steam ejectors.
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, subclass
104.16 for mechanical boiler cleaners that are not attached
to the boiler.
Subclass:
388
This subclass is indented under subclass 383. Devices in
which the conduit is provided with one or more valved ports.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45 for conduits with washout nozzles.
Subclass:
389
This subclass is indented under subclass 379. Devices having
means for blowing off or removing the surface water of the
boiler, i.e., "skimmers".
SEE OR SEARCH THIS CLASS, SUBCLASS:
400 for combinations of skimmers with a trapped circulating
conduit.
Subclass:
390
This subclass is indented under subclass 379. Devices
comprising fluid jet cleaners for removal of soot and ashes
when either the structure of the boiler or of the furnace is
modified for the reception of the cleaner when in operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
361 for structure of headers with cleaners for water tube
boilers.
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, see the
reference to Class 15 under "Search Class" in the class
definition of this class (122).
Subclass:
391
This subclass is indented under subclass 390. Devices
comprising a horizontal fire tube boiler and cleaner attached
permanently to the boiler or to the furnace walls.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 147, 150, 188+, 199+, 296+, and 297+
for feeding air and steam jets that are intended to aid
combustion, but which might also act as fluid jet cleaning
devices.
Subclass:
392
This subclass is indented under subclass 390. Devices
comprising a water tube boiler with the cleaner attached
either to the furnace walls or boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
361 for structure of headers.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 98, 147, 150, 188+, 199+, 296, and
297+, for devices for feeding air and steam to assist the
combustion of fuel that would also serve as cleaning jets.
Subclass:
393
This subclass is indented under subclass 379. Devices
comprising mud drums and the necessary modifications in the
boiler structure for their application.
SEE OR SEARCH THIS CLASS, SUBCLASS:
52 137, 192, for drums forming bridgewalls for horizontal
cylindrical boilers.
259 363, 365, for water tube boiler drums.
444 for drums for water tube boilers with special feed
heating means.
Subclass:
394
This subclass is indented under subclass 379. Devices
comprising receptacles, either open at the top or closed, but
having openings for the passage of water therethrough, for
receiving the sediment precipitated from the water. The pan
may have a conduit leading to the mud drum.
SEE OR SEARCH THIS CLASS, SUBCLASS:
386 for pans with blow-off conduits leading from the pan to
the outside of the boiler.
430 for boilers provided with an internal conduit for
delivering feed water to the mud drum.
Subclass:
395
This subclass is indented under subclass 379. Devices
comprising sand blast cleaning devices.
SEE OR SEARCH CLASS:
406, Conveyors: Fluid Current, appropriate subclasses for
fluid current conveying of solid material in general.
451, Abrading, 75 for a sandblast machine.
Subclass:
396
This subclass is indented under subclass 379. Devices
comprising apparatus and processes for cleaning and filling
boilers where an interchange of heat is effected between the
blow-off water and the clean filling water.
Subclass:
397
This subclass is indented under subclass 379. Devices
provided with one or more conduits, through which the boiler
water is caused to pass, and having some form of trap or
filter in the circuit, after passing which the water is
returned to the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 and 202, for boilers also having trapped circuits.
414 and 415, for circulation features without the sediment
trap.
Subclass:
398
This subclass is indented under subclass 397. Devices
provided with means for introducing feed water into the
circulating conduit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
403 for a feed water means with a heater.
414 for similar arrangement of conduit with feed water
introduction without the sediment trap.
Subclass:
399
This subclass is indented under subclass 397. Devices with
means for withdrawing the water from the boiler into the
circulation conduits from the top or the bottom, or both.
SEE OR SEARCH THIS CLASS, SUBCLASS:
202 and 381, for blow-off devices taking the water from
either the surface or the bottom.
382 for special features of outlets.
389 for surface blow-off devices and for "skimmers" adapted
to be used on the surface outlets of the circuit devices of
this subclass.
Subclass:
400
This subclass is indented under subclass 397. Devices in
which water is caused to pass from the surface of the boiler
through the conduits.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 and 202, for a water tube circuit with sediment trap.
389 for "skimmers".
399 for combination of surface and bottom outlets to a
trapped circuit.
415 for surface exit circulating circuits without a trap in
the circuit, but having a forced circulation by means of a
mechanical pump, with feed water introduced into the
circuit.
Subclass:
401
This subclass is indented under subclass 400. Devices with
means for feeding a chemical or some composition to the
circuit for precipitating the salts in the water.
SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, 177 for a heater,
chemical feeder and separator combination. See the search
notes thereunder.
Subclass:
402
This subclass is indented under subclass 400. Devices in
which a circulating pump is in the circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
404 for similar arrangement of conduit and trap, with a
steam jet for circulating the water.
Subclass:
403
This subclass is indented under subclass 400. Devices having
in combination therewith a heater for the feed water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
415 for allied art without the sediment trap.
Subclass:
404
This subclass is indented under subclass 400. Devices in
which the circulation is aided by means of a steam jet
located at some point of the circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
384 for steam jet blow-offs.
402 for this subject matter where the circulation is
maintained by a mechanical pump.
Subclass:
405
This subclass is indented under subclass 379. Devices
comprising nozzles or conduits having one or more discharge
orifices, either permanently attached to the inside of the
boiler or of such structure that they are not of general
application in other arts, for washing the sediment from the
tubes or boiler walls.
SEE OR SEARCH THIS CLASS, SUBCLASS:
383 for structures that are also adapted to serve as washout
nozzles.
390 for structure of nozzles.
Subclass:
406.1
CIRCULATION:
This subclass is indented under the class definition.
Devices not otherwise classified comprising means for
regulating the circulations of water in the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11 for rotary boilers.
36 and 407, for steam and water jets that help the
circulation.
39 and 59, for horizontal fire tube boilers with a drop
water firebox having a conduit located either outside or
inside the boiler for aiding the circulation.
69 and 196, where the boiler circulation ceases through
certain parts when feed water is fed to the boiler and the
parts serve as a feed water heater.
83 for horizontal boilers with fire tubes having transverse
diaphragms for assisting the circulation.
91 118 and 159, for vertical fire tube and vertical flue
boilers with internal tubes or sleeves for increasing the
circulation.
123 for vertical fire tube boilers with transverse
diaphragms.
202 for horizontal cylindrical boilers having a sediment
trap through which the water circulates.
258 for boilers in which the circulation is downward through
water tubes.
292 and 366, for absorbent wicks, within the boiler space.
379 for circulation devices in combination with means for
cleaning the boiler or purifying the water.
414 415, 418, 419, 428+, 442, and 444, for circulation
features combined with the heating and introduction of feed
waters.
488 for combined separators for steam and circulation
devices.
495 for circulation devices for protecting the crown sheet.
501 and 502, for displacing elements within water tubes.
SEE OR SEARCH CLASS:
417, Pumps, appropriate subclasses for pumps, per se.
418, Rotary Expansible Chamber Devices, for rotary expansible
chamber pumps, per se.
Subclass:
406.2
Having anticavitation devices:
This subclass is indented under subclass 406.1. Devices
wherein means are provided to prevent the formation of a
vortex in a circulating fluid.
Subclass:
406.3
Having restrictors or orifices:
This subclass is indented under subclass 406.1. Devices
having outlets or means to confine a fluid during
circulation.
Subclass:
406.4
Once through:
This subclass is indented under subclass 406.1. Devices
wherein the fluid is turned to steam on a single circuit
through the heater.
Subclass:
406.5
With start up operations:
This subclass is indented under subclass 406.1. Devices
having a specific set of initial conditions.
Subclass:
407
This subclass is indented under subclass 406. Devices
comprising an injector or tubes connected in such a manner as
to act like an injector and having means for heating part of
the water to a higher temperature in a separate compartment
or conduit that delivers the water heated in the separate
compartment to the injector for increasing the circulation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
384 398 and 404, for related art on the injector action.
Subclass:
408.1
Having internal conduit:
Devices under subclasses 406.1+ comprising boilers having
conduits located inside the boiler and generally below the
water line for accelerating the circulation of the water in
the boiler. These conduits may consist of tubes, inverted
bells, cylinders, or even plates spaced apart from each other
or spaced from the boiler walls or tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
36 and 407, for special types of circulating devices.
59 for conduits, either internal or external, for aiding the
circulation of horizontal fire tube boilers with a drop water
firebox.
83 for plates or diaphragms, arranged transversely of a
horizontal fire tube boiler for aiding the circulation.
118 for internal circulation tubes, cylinders, or sleeves
for vertical fire tube boilers.
159 for internal circulation tubes, cylinders, or sleeves
for vertical flue boilers.
379 for internal circulating conduits combined with water
purifying and boiler cleaning apparatus.
412 for circulation features combined with feed water
heaters.
488 for circulation devices combined with a steam
separator.
Subclass:
408.2
With internal geyser tube:
This subclass is indented under subclass 408.1. Devices
wherein a conduit is placed such that heated fluid at a low
level is transported rapidly to a higher level.
Subclass:
409
This subclass is indented under subclass 408. Devices
comprising horizontal large flue boilers.
Subclass:
410
This subclass is indented under subclass 409. Devices having
return fire tubes.
Subclass:
411
This subclass is indented under subclass 406. Devices
comprising mechanical devices located inside the boilers for
circulating or agitating the water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
380 for agitators and water circulators of a mechanical type
when they have the additional function of removing sediment
from the boiler or transferring it from one part of the
boiler to another.
Subclass:
412
This subclass is indented under the class definition.
Subject matter comprising means for preheating water being
fed to a boiler or principal heater.
(1) Note. In order that devices for heating feed water
shall be classified in any of the boiler subclasses they must
be so intimately connected and combined with the boiler
structure that they are inseparable therefrom or not of
general application for heating water and not excluded
therefrom by the main definition of this class. Devices for
heating water that may be used for boiler purposes or for any
other purposes, are not classified in this class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1 and 3, for combinations of feed heaters with other
elements that form a boiler plant.
20 for structure of devices for heating water that could
readily be applied for heating feed water (this is a very
closely related subclass).
36 for boilers having means for heating the water by steam
jets or tubes before the boiler is fired up.
37 for closures of boilers having separate compartments, one
compartment being used for impure water full of mud or salt,
the steam passing to the other compartment which contains
purified water, and feed heaters.
40 for flash boilers having a preheater for the water
intimately associated with the flash boiler.
62 63 and 65, for heating water introduced into the heaters
in the firebox.
68 and 196, for boilers provided with heating tubes through
which the boiler water circulates and is heated, but when the
feed water is being fed to the boiler the boiler circulation
is stopped by means of automatically operated valves and the
feed water is heated in the tubes before it is conducted to
the main part of the boiler.
82 for horizontal fire tube boilers with superposed feed
water heaters in open communication with the boiler,
delivering water to the bottom of the boiler from the feed
heater.
83 and 123, for horizontal fire tube and vertical fire tube
boilers, respectively, that have transverse diaphragms, the
feed water entering the compartment farthest from the firebox
and being progressively heated as it approaches the firebox.
89 for water arches at the rear of horizontal fire tube
boilers that serve as feed water heaters.
106 for horizontal fire tube boilers having water walls that
may be used as a feed water heater.
118 and 159, for special types.
125 for similar structure for feed heaters.
151 for horizontal flue boilers having return fire tubes,
with a smokebox closure having a separate comparment that may
serve as a feed water heater.
189 190, 193+, and 202, for boilers where water is introduced
into a certain part of the structure before passing to the
main part of the boiler.
192 for water bridge walls and drums where water is
introduced and heated.
195 for means for heating feed water when it is introduced
(these are really main boiler structures with means for
incidentally heating the water when it is introduced before
it enters the horizontal cylinder).
371 for water grates (water grates used as feed water
heaters will be found in the various types of boilers having
water grates; a complete list of boilers with water grates is
given in the "search notes" to subclass 371).
379 for feed water heaters combined with boiler cleaning
devices, traps, and filters.
396 for combined cleaning and feed water heating system
where the blow-off water is used to heat the feed water when
refilling the boiler (especially used for cleaning and
filling locomotive boilers).
398 for boilers having a circulating conduit provided with a
sediment trap or filter, the water being introduced into the
circulating conduit.
403 for feed heaters having a sediment trap (compare also
subclasses 91 and 202).
457 and 458, for gravity boiler feeders with incidental feed
water heater.
477 for combination of a water tube boiler with a steam
superheater and a feed water heater.
494 for surrounding casings to prevent radiation of heat
from a boiler which heats feed water.
497 for feed heating furnace and boiler front.
498 for water-cooled doors for heating feed water.
499 and 500, for furnace mouths or fuel door openings
provided with water heaters and used for heating feed water.
SEE OR SEARCH CLASS:
60, Power Plants, appropriate subclasses for feed water
heaters in power plants.
165, Heat Exchange, appropriate subclasses for a heat
exchanger, per se, even though disclosed as a feed water
heater.
210, Liquid Purification or Separation, 175 for a heater or
heat exchanger combined with a separator, and subclasses
198.1+ for a separator with means to add treating material,
e.g., steam.
261, Gas and Liquid Contact Apparatus, appropriate subclasses
for apparatus that contact a liquid with a gas not limited to
heat exchange but which may be disclosed as a feed water
heater.
Subclass:
413
This subclass is indented under subclass 412. Feed heaters
that are either located in the ash pan or ash box or form
part of the structure thereof.
Subclass:
414
This subclass is indented under subclass 412. Subject matter
in which a conduit is in circuit with a boiler, with means
for introducing feed water into the circuit, thereby mixing
the feed with the boiler water before introduction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
398 403 and 415, and structural subclasses of boilers
generally, for the special structure of boilers having means
for introducing feed water into certain parts of the boiler
circulating system.
Subclass:
415
This subclass is indented under subclass 412. Subject matter
having a circulating conduit communicating with a boiler at
the water level, having a mechanical pump in the circuit for
withdrawing water from the boiler at the water line and
returning it to the boiler at some other point and having
means for heating the feed water by means of either the
surface or jet type and injecting the feed water into the
boiler or conduit, but so arranged that the water level in
the boiler will be maintained.
SEE OR SEARCH THIS CLASS, SUBCLASS:
398 402, 403, and 406, for combinations of circulating pump
with boiler.
414 for feed water introduced into the circuit.
Subclass:
417
This subclass is indented under subclass 412. Feed heaters
located in the steam space of a boiler and consisting of
plates or receptacles superimposed in such a way that the
feed water falls from one to the other. The heater may or
may not have means for trapping the sediment and blowing it
out of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
435 438 and 443, for other pan or tray structures used in
feed heater structures.
SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, 198.1 for separating
means with means to add a treating material, e.g., steam.
261, Gas and Liquid Contact Apparatus, for structure of
plates and receptacles in Gas and Liquid Contact Apparatus of
general utility.
Subclass:
418
This subclass is indented under subclass 412. Subject matter
combined with fire engine boilers with the water heater
attached to the boiler or some part of the engine apparatus
for keeping the water in the boiler hot when the boiler is
not fired up.
Subclass:
419
This subclass is indented under subclass 412. Water heaters
for keeping water in a fire engine boiler hot when the fire
engine is in the engine house and the firebox is not in use,
which consist of a stationary water heater located in the
engine house, adapted to be coupled to the fire engine boiler
to establish a water circulation.
SEE OR SEARCH CLASS:
237, Heating Systems, subclass 12.2 for combinations of this
heating device with the heating system of the engine house.
Subclass:
420
This subclass is indented under subclass 412. Feed water
heaters which are heated by furnace gases only.
(1) Note. See the structural subclasses under the different
types of boilers for feed heaters heated by furnace gases
where the heater forms a part of the boiler, and boiler water
circulates therethrough other than when the feed water is
being fed to the feed water heating section and not merely as
an alternate operation. For certain specialized feed heaters
see "Search this class" below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
371 and the subclasses listed in the search notes
thereunder, for water grates that serve as feed water
heaters.
412 and the subclasses listed in the search notes thereunder
for further directions as to feed water heaters.
Subclass:
421
This subclass is indented under subclass 420. Feed water
heaters not of general application in other arts for heat
transference, located in the waste heat flue or "offtake"
flue of the boiler, between the boiler and smokestack.
Subclass:
422
This subclass is indented under subclass 412. Feed water
heaters heated by furnace gases and steam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
403 425, 432, and 434, for special types of heaters of this
nature.
Subclass:
423
This subclass is indented under subclass 412. Feed water
heaters in horizontal fire tube boilers and located either
within the smokebox or forming a part of the smoke box
structure.
(1) Note. A "smokebox" is distinguished from a "smoke
chamber" in that the former consists of a closed chamber at
the end of the boiler, into which the products of combustion
pass directly from the fire tubes and thence to the
smokestack, while a "smoke chamber" is a chamber at the end
of the boiler, into which the products of combustion enter
either from the fire tubes or from the flue outside of the
boiler and do not pass directly out of the chamber, but may
return through other boiler flues.
SEE OR SEARCH THIS CLASS, SUBCLASS:
151 for a return fire tube boiler having a smoke box
containing water tubes.
Subclass:
424
This subclass is indented under subclass 423. Subject matter
comprising a water-jacketed exhaust "lift" pipe.
Subclass:
425
This subclass is indented under subclass 423. Feed water
heaters heated both by furnace gases and by steam, which may
or may not come into contact with the feed water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
422 432 and 440, for other types of feed heaters heated by
furnace gases and steam in combination.
Subclass:
426
This subclass is indented under subclass 423. Feed water
heaters consisting of either water tubes located in smokebox
or of a water walled casing, forming the smokebox, provided
with water tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
465 for similar structure used as a steam superheater.
Subclass:
427
This subclass is indented under subclass 412. Feed heaters
for horizontal fire tube boilers located in the smoke chamber
at the rear of the boiler or having one side exposed to the
heat of the products of combustion as they pass through the
chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
423 (1) Note, for distinction between "smokebox" and "smoke
chamber".
Subclass:
428
This subclass is indented under subclass 412. Subject matter
comprising a conduit located inside a boiler for heating the
water before it is finally delivered to the boiler from the
conduit. The feed water may or may not be mixed with boiler
water or steam before its final delivery to the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
36 and 444, for device where feed water is injected into the
boiler water tubes for heating the water and increasing
circulation.
Subclass:
429
This subclass is indented under subclass 428. Subject matter
in which the conduit has a sediment trap provided with one or
more valves automatically operated when the blow-off valve of
the trap is opened to change the course of flow of the water
and clear the trap of sediment.
Subclass:
430
This subclass is indented under subclass 428. Subject matter
in which the conduit delivers it toward the blow-off end or
mud drum of the boiler.
Subclass:
431
This subclass is indented under subclass 428. Subject matter
in which a filter is located in the conduit inside the
boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
428 and 429, for traps inside the boiler.
Subclass:
432
This subclass is indented under subclass 428. Subject matter
connected in series with a furnace, gas type. That is, the
water is heated in a conduit heated by products of combustion
and then passes into a conduit within the boiler, where it is
heated before delivery thereto, or is heated in conduits
passing through the boiler and then in a furnace gas heated
chamber or conduit and then delivered to the boiler.
Subclass:
433
This subclass is indented under subclass 428. Subject matter
where there is a trap or filter outside the boiler, through
which the water passes before it enters such feed heater.
Subclass:
434
This subclass is indented under subclass 412. Subject matter
combined with the water tank of a locomotive tender.
Subclass:
435
This subclass is indented under subclass 412. Subject matter
comprising an open receptacle or pan located within the steam
space of the boiler, in which water is fed and heated. The
pan may be provided with devices for intercepting the
sediment that is precipitated and for blowing it off.
SEE OR SEARCH THIS CLASS, SUBCLASS:
417 and 438, for structure of pans and sprayers.
Subclass:
436
This subclass is indented under subclass 435. Subject matter
with means for spraying feed water to the pan. The pan is
generally provided with means for collecting the sediment and
blowing it off.
Subclass:
437
This subclass is indented under subclass 412. Subject matter
comprising a conduit leading from a boiler safety valve to a
water receptacle for heating the water when the steam escapes
from the safety valve.
Subclass:
438
This subclass is indented under subclass 412. Subject matter
comprising means for spraying water into the steam space of a
boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
417 and 436, for structure of spraying devices in other
types of feed water heaters.
SEE OR SEARCH CLASS:
239, Fluid Sprinkling, Spraying, and Diffusing, appropriate
subclasses for related spray structures which may be used to
inject water into a boiler.
Subclass:
439
This subclass is indented under subclass 412. Subject matter
wherein the feed water heater either forms part of a stack or
is located in a smokestack.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20 for water heaters of general application located in the
smokestack or chimney.
123 and 440, for stack feed water heaters heated by both
furnace gases and steam.
Subclass:
441
This subclass is indented under subclass 412. Subject matter
comprising means for heating the feed water by means of live
or exhaust steam.
Subclass:
442
This subclass is indented under subclass 441. Subject matter
where the live or exhaust steam comes into contact with the
water to be heated. This is a miscellaneous subclass for
steam injected feed water heaters not otherwise provided
for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
434 435, 436, 437, 438, 443, and 444, for special types of
heaters using steam.
457 and 458, and search note thereunder, for devices mixing
water with exhaust steam and returning it to the boiler.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 654 for devices for mixing water
with exhaust steam and returning it to the boiler of power
plants.
210, Liquid Purification or Separation, 198.1 for separating
means with means to add a treating material, e.g., steam.
261, Gas and Liquid Contact Apparatus, for feed water heaters
and purifiers not connected with the boiler structure of the
steam injected type.
Subclass:
443
This subclass is indented under subclass 442. Subject matter
comprising closed chambers or receptacles located over a
boiler in open communication with the steam space and means
for injecting water thereto that it may be heated by contact
with the steam before it enters the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
425 and 442, for similar parts.
SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, 198.1 for separating
means with means to add a treating material e.g., steam.
261, Gas and Liquid Contact Apparatus, for gas and liquid
contact apparatus not limited to heat exchanging.
Subclass:
444
This subclass is indented under subclass 412. Miscellaneous
subject matter wherein the feed water is heated in a water
tube boiler, whether the water be heated outside or inside
the water space of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
347 and 365, for disclosures of feed water heating devices
within the steam and water drum of a water tube boiler.
477 for combinations of feed heaters and superheaters.
Subclass:
446
This subclass is indented under the class definition.
Devices for feeding both fluid fuel to the burner and water
to the boiler that are not automatically regulated.
Subclass:
447
This subclass is indented under subclass 446. Devices with
automatic mechanism for cutting off the fuel supply when the
water level in the boiler becomes either too high or too low
or both.
SEE OR SEARCH CLASS:
236, Automatic Temperature and Humidity Regulation, for such
controls, per se.
Subclass:
448.1
AUTOMATIC CONTROL OF FLUID FUEL AND WATER:
This subclass is indented under the class definition.
Devices for controlling automatically both the feed of fluid
fuel to the burner and the feed of water to the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.1-14.31, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a condition responsive feature.
SEE OR SEARCH CLASS:
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 351.1 for a fluid fuel burner
other than a top-accessible liquid heating vessel and a
condition responsive feature; or subclass 374.1 for an
open-top liquid heating vessel that may include a lid and a
condition responsive feature.
137, Fluid Handling, subclass 94 for a condition responsive
system where fuel is proportioned or correlated to some
boiler or water system condition.
236, Automatic Temperature and Humidity Regulation,
appropriate subclass, for the control, per se, for the fuel
feed.
417, Pumps, 279 for pumps having condition responsive
control of the pumped fluid.
Subclass:
448.2
Having fuel or feed bypass:
This subclass is indented under subclass 448.1. Devices
wherein means are provided to deflect water feed or return
excess fuel based on steam pressure.
Subclass:
448.3
Multiple boiler regulation:
This subclass is indented under subclass 448.1. Devices
wherein a plurality of boilers are controlled.
Subclass:
448.4
Once through:
This subclass is indented under subclass 448.1. Devices
wherein the fluid is turned to steam on a single circuit
through the heater.
Subclass:
449
This subclass is indented under the class definition.
Devices for automatically controlling the combustion of solid
fuel and the regulation of the water feed to boilers,
depending upon the conditions within the boiler. This is
accomplished either by steam pressure or the temperature of
the water or steam.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 103 and 188 for boiler controlled
fuel feeders.
Subclass:
450
This subclass is indented under the class definition.
Subject matter comprising boilers that are movably supported
to control either the combustion of the fuel or water feed or
both.
Subclass:
451
This subclass is indented under the class definition.
Devices for introducing water to boilers and controlling the
introduction not otherwise provided for. Those devices that
are of general application for feeding water to tanks, either
open or closed, whether a boiler be disclosed or claimed in a
general way, are not classified in class 122 at all, but are
placed in classes that will be noted below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1 for boiler plants having a boiler feeder in combination.
11 where the movement of the boiler is combined with the
feeding of water.
40 and 41, for boilers of the flasher type having special
means for introducing water into the boiler combined
therewith.
365 428 and 444, for devices disclosing feed introducing
apparatus for water tube boilers.
366 for absorbent wicks for feeding water from one portion
of the boiler to another.
396 for combined cleaning, heating, and feeding devices.
398 and 403, for combined purifiers, circulators, heaters
and feed introduction.
406 for feed introduction combined with circulation.
414 for injecting water into a circuit taking water from the
boiler.
415 for boilers having a circuit communicating with the
boiler and provided with a pump for withdrawing water from
the water level in the boiler, introducing feed water, mixing
it with the boiler water in the circuit, and maintaining the
water level.
417 435, 436, and 438, for devices for introducing water into
the steam space.
431 and 433, for feed water conduits provided with traps and
filters.
446 for combinations of fuel and water feeders.
446 through 449, under Regulation, Fuel and Water, Automatic
control for automatic control of both fuel and water to the
boiler.
447 for feeders with automatic cut-off for the fluid fuel
upon the occurrence of an abnormal water level.
450 where the feed is governed by the movement of the boiler
itself.
452 for art in this class where the feed is controlled by
the pressure inside the boiler.
495 when water is fed upon the crown sheet.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 667 for a power plant energized
by externally applied heat in which the boiler feed is
automatically controlled.
95, Gas Separation: Processes, 241 for degasification of
liquid, especially subclass 244 for plural successive
degassing treatments of boiler feed water.
96, Gas Separation: Apparatus, 155 for degasifying means
for liquid.
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 380.1 for an open-top liquid
heating vessel that may include a lid and a supply of liquid
to the vessel.
137, Fluid Handling, 156 for gas pressure discharge of a
liquid as to a boiler, subclasses 171+ for steam traps,
subclasses 386+ for liquid level responsive control of a
valve.
200, Electricity: Circuit Makers and Breakers, subclass 84
for electrical switches for controlling feed valves of
boilers operated by a float.
236, Automatic Temperature and Humidity Regulation,
subclasses 55-60 for thermostatically operated steam traps;
and subclass 52 for combinations of thermostatic valves and
float valves or pressure operated valves in steam traps.
237, Heating Systems, 9 for automatically controlled heating
systems having means for introducing or controlling the
introduction of water to boilers.
417, Pumps, 36 for liquid level responsive control of a
motor driving a pump, subclass 182.5 for liquid level
responsive control of a jet pump and subclass 211.5 for
liquid level responsive control of a pump displacement or
drive transmission.
Subclass:
451.1
This subclass is indented under subclass 451. Devices for
automatically controlling flow of feed-water to a boiler by
thermal responsive means, usually a thermostat of the
expanding-solid type, which is exposed more or less to the
steam as the water-level varies.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.3 14.31, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) and a condition responsive feature that
controls the flow of the water.
504.2 for thermal means which operate a valve, on drop of
water-level below a certain limit, to operate an alarm or
indicator.
Subclass:
451.2
This subclass is indented under subclass 451.1. Devices in
which the controlling-valve is operated by fluid-pressure
means, which may be the pressure generated in a thermostat of
the expanding-fluid type.
Subclass:
452
This subclass is indented under subclass 451. Devices having
means for controlling the supply by boiler pressure. This
subclass also contains patents having claims to boiler
structure combined with the feeding mechanism.
SEE OR SEARCH THIS CLASS, SUBCLASS:
448.1 and 449, for the combination of the feed water and the
fuel controlling devices depending on boiler pressure.
SEE OR SEARCH CLASS:
417, Pumps, 279 for pumps having condition responsive
control of the pumped fluid.
Subclass:
456
This subclass is indented under subclass 451. Devices
consisting of one or more closed tanks or receptacles having
automatically controlled inlet and outlet valves for
admitting water to the tank and discharging it therefrom, and
also having means for equalizing the pressure between the
tank and the boiler, whereby the water will fall by gravity
into the boiler, the tank being located above the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.3 14.31, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) and a condition responsive feature that
controls the flow of the water.
SEE OR SEARCH CLASS:
137, Fluid Handling, 156 for gas pressure discharge of a
liquid in general, and subclasses 386+ for liquid level
responsive valves.
Subclass:
457
This subclass is indented under subclass 456. Devices having
means for heating the feed water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
458 for hand operated gravity feeders with a heater.
Subclass:
458
This subclass is indented under subclass 451. Gravity
feeders having means for heating the feed water, but not of
the automatic type.
Subclass:
459
This subclass is indented under the class definition.
Apparatus and methods for treating steam or vapor, either by
superheating or cooling it, or by expanding or compressing
it, or by any combination of operations.
SEE OR SEARCH THIS CLASS, SUBCLASS:
487 for superheaters having means for injecting water into
the steam.
SEE OR SEARCH CLASS:
219, Electric Heating, for electric heating devices for
superheating steam.
Subclass:
460
This subclass is indented under subclass 459. Subject matter
comprising general combinations of boilers of a miscellaneous
structure with steam superheaters, not defined in other
subclasses. Superheaters of use only as a steam superheater
are classified here.
SEE OR SEARCH THIS CLASS, SUBCLASS:
477 for combinations of water tube boilers with steam
superheaters and feed water heaters.
485 for superheaters with a separate furnace.
Subclass:
461
This subclass is indented under subclass 459. Subject matter
comprising steam superheaters in combination with horizontal
fire tube boilers or flue boilers of a miscellaneous
character.
SEE OR SEARCH THIS CLASS, SUBCLASS:
469 and 481, for superheaters related to fireboxes.
Subclass:
462
This subclass is indented under subclass 461. Devices
relating to the structure and arrangement of a steam tube
superheater having steam tubes extending from the smokebox of
a horizontal fire tube boiler into the fire tubes.
Subclass:
463
This subclass is indented under subclass 461. Devices
comprising horizontal fire tube boilers having a steam space
within the boiler separate from the main steam space, in
which are fire tubes for superheating the steam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
482 for boilers having fire tubes in the steam space of a
boiler for superheating the steam.
Subclass:
464
This subclass is indented under subclass 461. Devices
relating to the structure and arrangement of a superheater
for steam having fire tubes passing through the steam chamber
of the superheater, located at the smokebox end of a
horizontal fire tube boiler.
Subclass:
465
This subclass is indented under subclass 461. Devices
relating to the structure and arrangement of a steam tube
superheater at the smokebox end of a horizontal fire tube
boiler and generally located in the smokebox.
Subclass:
466
This subclass is indented under subclass 459. Subject matter
comprising fire tube boilers or large flue boilers having
both a steam superheater and a feed water heater combined
therewith.
Subclass:
467
This subclass is indented under subclass 459. Subject matter
relating to the structure and general arrangement of
superheaters for vertical fire tube boilers, except those
located in the firebox.
SEE OR SEARCH THIS CLASS, SUBCLASS:
468 and 481, for analogous superheaters.
Subclass:
468
This subclass is indented under subclass 459. Subject matter
comprising vertical flue boilers having water tubes within
the flue, in combination with a steam superheater.
Subclass:
469
This subclass is indented under subclass 459. Subject matter
comprising superheaters located at the rear of the firebox or
back of the bridge wall of miscellaneous boilers extending
horizontally. The boiler is generally of the horizontal
cylindrical type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
464 for general combination of superheater with horizontal
fire tube boilers.
481 for superheaters located in the firebox.
Subclass:
470
This subclass is indented under subclass 459. Subject matter
relating to the structure and arrangement of a superheater in
the waste heat flue of a horizontally located boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
412 and especially subclass 421 for heat exchange features
in feed heaters.
SEE OR SEARCH CLASS:
165, Heat Exchange, 157 for a tube assembly in a casing or
flue of general utility.
Subclass:
471
This subclass is indented under subclass 459. Subject matter
relating to the structure and general arrangement of a steam
superheater within the combustion space of a water tube
boiler having banks of water tubes rearwardly declined over
the bridge wall and in communication with front and rear
headers, which are in communication with a declined drum
posited above the water tubes.
Subclass:
472
This subclass is indented under subclass 459. Subject matter
relating to the structure and general arrangement of a
superheater in the combustion space of a water tube boiler
having banks of water tubes rearwardly declined over the
bridge wall and communicating with headers at each end, which
headers communicate with a longitudinal drum posited above
the water tubes.
Subclass:
473
This subclass is indented under subclass 459. Subject matter
comprising superheaters for water tube boilers having a
longitudinal drum not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
472 for longitudinal drum superheaters.
Subclass:
474
This subclass is indented under subclass 459. Subject matter
comprising superheaters for water tube boilers having banks
of tubes over the bridge wall.
Subclass:
475
This subclass is indented under subclass 459. Subject matter
relating to the structure and general arrangement of a steam
superheater in the combustion space of a water tube boiler
having a stand pipe provided with spur water tubes.
Subclass:
476
This subclass is indented under subclass 459. Subject matter
comprising water tube boilers having superheaters for steam
combined with the boiler in the same heating chamber.
SEE OR SEARCH THIS CLASS, SUBCLASS:
474 for superheaters for water tube boilers of a
miscellaneous type, with water tubes over the bridge wall.
477 for water tube boilers having a superheater for steam
and a feed water heater.
Subclass:
477
This subclass is indented under subclass 459. Subject matter
comprising water tube boilers provided with both a
superheater for steam and a feed water heater.
Subclass:
478
This subclass is indented under subclass 459. Subject matter
relating to superheaters for water tube boilers having one or
more transverse drums.
Subclass:
479.1
Automatic heat regulation of superheater:
This subclass is indented under subclass 459. Subject matter
relating to steam superheaters having means for automatically
regulating the temperature of the superheated steam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
448.1 449 and 452, for closely allied art and special
features of controlling devices.
SEE OR SEARCH CLASS:
60, Power Plants, subclass 666 for the automatic control of
the by-pass of a superheater in a power plant.
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 351.1 for a fluid fuel burner
other than a top-accessible liquid heating vessel and a
condition responsive feature.
236, Automatic Temperature and Humidity Regulation, for
structure of the controlling device.
Subclass:
479.2
Having gas recirculation:
This subclass is indented under subclass 479.1. Devices
wherein the products of combustion are returned to an earlier
stage of combustion.
Subclass:
479.3
Having flame positioning:
This subclass is indented under subclass 479.1. Devices
wherein the location of the combustion flow can be varied.
Subclass:
479.4
With variable firing:
This subclass is indented under subclass 479.1. Devices
wherein the firing order of the burners can be changed.
Subclass:
479.5
Having dampers:
This subclass is indented under subclass 479.1. Devices
wherein an adjustable plate controls the draft.
Subclass:
479.6
Plural furnaces:
This subclass is indented under subclass 479.1. Devices
wherein there are multiple combustion chambers.
Subclass:
479.7
Once through:
This subclass is indented under subclass 479.1. Devices
wherein the fluid is turned to steam as a single circuit
through the heater.
Subclass:
480
This subclass is indented under subclass 459. Subject matter
relating to superheaters having a damper for varying the
amount of heat to which the superheater is subjected and
their arrangement with the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
479.1 for superheater automatic heat regulation.
Subclass:
481
This subclass is indented under subclass 459. Subject matter
relating to superheaters located in the firebox of any type
of boiler, or the superheater may be located around the
firebox.
Subclass:
482
This subclass is indented under subclass 459. Subject matter
relating to boilers having fire tubes in the steam space of
the boiler for superheating the steam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
463 for fire tubes heating a separate steam chamber in the
boiler.
486 for superheated steam domes.
Subclass:
483
This subclass is indented under subclass 459. Subject matter
relating to devices for superheating steam indirectly by
heating a fluid or fusible solid and transferring the heat of
the fluid or melted mass to the steam.
(1) Note. Compare the subclasses, in this class, indented
under Indirectly heated, separate fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
479.1 for this type of superheater having an automatic
temperature regulator.
Subclass:
484
This subclass is indented under subclass 459. Subject matter
relating to superheaters provided with means for heating the
steam in separate charges, each charge or portion being cut
off and isolated from the main steam line while being
superheated.
Subclass:
485
This subclass is indented under subclass 459. Subject matter
relating to steam superheaters having a separate furnace for
heating them.
Subclass:
486
This subclass is indented under subclass 459. Subject matter
relating to steam domes provided with means for drying or
superheating the steam, excluding mere steam separators.
SEE OR SEARCH THIS CLASS, SUBCLASS:
492 for steam domes with separators.
508 for steam domes without separators.
Subclass:
487
This subclass is indented under subclass 459. Subject matter
relating to means for injecting water into superheated steam
or to structure of superheaters with water injection
mechanism.
SEE OR SEARCH CLASS:
236, Automatic Temperature and Humidity Regulation, 12.1 for
structure of the control device.
261, Gas and Liquid Contact Apparatus, for desuperheating
apparatus of this type when independent of the boiler.
Subclass:
488
This subclass is indented under the class definition.
Devices located within the boiler for separating the steam
from the water as it circulates in the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
408 for circulating conduits with incidental steam
separators.
Subclass:
489
This subclass is indented under the class definition.
Separators located in the steam main leading from the boiler
with means for automatically returning the water to the
boiler.
SEE OR SEARCH CLASS:
96, Gas Separation: Apparatus for apparatus for gas
separation, per se.
Subclass:
490
This subclass is indented under the class definition.
Subject matter relating to mechanism for preventing water
being carried out of the boiler into the steam main when the
boiler is tilted or inclined from a normal horizontal
position, as, for instance, when a ship is pitching or
rolling or when a traction engine or locomotive is ascending
or descending a grade.
SEE OR SEARCH THIS CLASS, SUBCLASS:
495 for allied art, and see the notes thereto.
Subclass:
491
This subclass is indented under the class definition.
Subject matter relating to steam separators located either
within the steam space of a boiler or in the steam space, in
combination with a separator in the steam dome or steam main
or at the outlet of the boiler, so that the water will fall
back into the boiler when steam is being discharged.
Includes separators of the nature defined, although they may
be used in a sugar evaporator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
488 and see the notes thereunder, for means for separating
steam from the water circulation of the boiler.
489 for separators in the steam main with means for
returning the water to the boiler.
492 for steam domes with separators.
SEE OR SEARCH CLASS:
96, Gas Separation: Apparatus, for apparatus for gas
separation, per se.
137, Fluid Handling, 171 for steam and water separator
traps.
236, Automatic Temperature and Humidity Regulation,
subclasses 53-60, for steam traps.
Subclass:
492
This subclass is indented under the class definition.
Subject matter relating to steam separators located in the
steam dome of the boiler or to the structure of the steam
dome having steam separating apparatus.
SEE OR SEARCH THIS CLASS, SUBCLASS:
486 for steam domes with superheaters.
508 for steam domes without steam separators.
SEE OR SEARCH CLASS:
55, Gas Separation, subclass 417 and 418+ for separators and
flow control means combined and 440 for parallel and
continuous nonplanar separating members.
Subclass:
493
This subclass is indented under the class definition.
Subject matter comprising miscellaneous braces and stays and
their general arrangement with the boiler walls not included
in the definitions of other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
83 for supports for fire tubes for horizontal fire tube
boilers.
360 for braces and stays for headers and header structure.
496 for the general arrangement of stays and the structure
of crown sheets.
SEE OR SEARCH CLASS:
411, Expanded, Threaded, Driven, Headed, Tool-Deformed, or
Locked-Threaded Fastener, subclass 367 and 370,
respectively, for a threaded fastener and nut having a stay
bolt spacer sleeve or having a stay bolt bearing washer; and
subclasses 379+ for a threaded stay bolt, per se; and
subclass 505 for an unthreaded stay bolt, per se.
Subclass:
494
This subclass is indented under the class definition.
Subject matter relating to inclosures surrounding a boiler of
a miscellaneous nature not specially provided for in other
subclasses in this or any other main class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19.2 for a stand boiler (e.g., water heater, etc.) that
provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) and a casing for the stand boiler or an
external tank therefor.
SEE OR SEARCH CLASS:
52, Static Structures (e.g., Buildings), appropriate
subclasses for masonry or concrete constructions.
106, Compositions: Coating or Plastic, particularly subclass
40, 41, 75, 86+, and 122 for insulating compositions.
110, Furnaces, 336 for wall structures forming part of the
furnace which covers the boiler.
126, Stoves and Furnaces, for a water heater or steam
generator of an open or unpressurized type, or may be a
closed or pressurized type if it is part of the stove or
furnace structure, subclass 273.5 for a domestic oven using
a heat accumulator (e.g., fireless cooker, etc.) or subclass
375.1 for an open-top liquid heating vessel that may include
a lid having a heat accumulator.
138, Pipes and Tubular Conduits, particularly subclasses
32-35 for thawing and steam protection of pipes.
220, Receptacles, for casing structure of general utility.
252, Compositions, subclass 62, for heat insulating
compositions.
428, Stock Material or Miscellaneous Articles, appropriate
subclasses, for a stock material product in the form of a
single or plural layer web or sheet, where either the
material or the structure of the product may inherently
influence the loss or gain of heat; see particularly 304,
426+, 457+, and 920+ (a cross-reference art collection).
Subclass:
495
This subclass is indented under the class definition.
Subject matter relating to boilers having means to prevent
the crown sheet over the firebox from being uncovered by
water when the boiler is tilted from the normal horizontal
position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
490 for allied art.
SEE OR SEARCH CLASS:
180, Motor Vehicles, subclass 39 for devices to keep the
boiler of a steam traction engine level when going up or down
grade.
280, Land Vehicles, subclass 7 for means for levelling a
tank or boiler vehicle when on uneven ground.
Subclass:
496
This subclass is indented under the class definition.
Subject matter relating the structure of crown sheets and
braces and stays therefor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58 and 493, for miscellaneous braces and stays.
Subclass:
497
This subclass is indented under the class definition.
Subject matter relating to water-cooled fronts for boilers.
Subclass:
498
This subclass is indented under subclass 497. Subject matter
relating to furnace doors. There may or may not be a
circulatory communication with the boiler. The door may be
employed to heat water for any purpose or to generate steam.
SEE OR SEARCH CLASS:
110, Furnaces, subclass 180 for air-cooled furnace doors.
202, Distillation: Apparatus, 242 for distillation
apparatus closures.
Subclass:
499
This subclass is indented under subclass 497. Subject matter
relating to the same structure of the fuel feed opening of a
firebox having water heating chambers or conduits. The feed
water may be heated in this structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
93 94, 189, 190, 193, and 194, for related art.
Subclass:
500
This subclass is indented under subclass 499. Subject matter
relating to a water firebox.
Subclass:
501
This subclass is indented under the class definition.
Subject matter relating to boilers whose steam or water space
or some part thereof contains fluid displacing elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
40 242, 243, 406, and 509, for related art.
Subclass:
502
This subclass is indented under subclass 501. Subject matter
wherein the boiler is heated by fluid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
243 and 406, for related art.
Subclass:
503
This subclass is indented under the class definition.
Subject matter relating to the structure and arrangement of a
water-cooled baffle, which is generally located in the
firebox for receiving the impact of the burning fuel, either
fluid or comminuted solid fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
10 for fluid fuel burners.
Subclass:
504
This subclass is indented under the class definition.
Subject matter comprising devices not otherwise provided for
to prevent explosions or injury to boilers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.1-14.31, for a stand boiler (e.g., water heater, etc.)
that provides hot water for domestic or household use (e.g.,
cooking, cleaning, washing, bathing, space heating, etc.)
that may be in other than a house or home (e.g., apartment
building, office building, restaurant, laundry, recreational
vehicle, etc.) having a condition responsive feature.
125 164, 364, 437, 447, 450, and 490, for tilting boilers.
493 for braces and stays.
494 and 495, for different types of safety devices in this
class.
510 for supports.
SEE OR SEARCH CLASS:
55, Gas Separation, 309 for separator bypass or gas pressure
relief means.
73, Measuring and Testing, 290 for liquid level or depth
gauges.
96, Gas Separation: Apparatus, 399 for gas separation
apparatus having automatic control means for gas cutoff or
diversion.
126, Stoves and Furnaces, subclass 35 for safety valves.
137, Fluid Handling, 455 for line condition change
responsive valves, particularly subclasses 460, 486+ and 498
for valves which close in response to an excessive flow as
when the line breaks.
165, Heat Exchange, 279 for a heat exchanger with a pressure
or temperature responsive device, and subclass 134.1 for a
heat exchanger with a protective device.
200, Electricity: Circuit Makers and Breakers, subclass 84
for special safety switches.
220, Receptacles, for diaphragms for boilers and tanks that
break under a given pressure and for boiler manholes and
closures with safety attachments.
236, Automatic Temperature and Humidity Regulation, subclass
53 for related art.
237, Heating Systems, subclass 80 for steam traps that are
heated to prevent freezing.
261, Gas and Liquid Contact Apparatus, for safety devices for
condensers.
411, Expanded, Threaded, Driven, Headed, Tool-Deformed, or
Locked-Threaded Fasteners subclass 367 and 370,
respectively, for a threaded fastener and nut having a stay
bolt spacer sleeve or having a stay bolt bearing washer; and
subclasses 379+ for a threaded stay bolt per se; and subclass
505 for an unthreaded stay bolt, per se.
Subclass:
504.1
This subclass is indented under subclass 504. Subject matter
containing a fusible element which fuses, generally when the
water-level falls below a certain limit, and sounds an alarm
or allows the steam-pressure to fall.
Subclass:
504.2
This subclass is indented under subclass 504. Subject matter
which operate an alarm or indicator should dangerous
conditions arise in the boiler, usually by a
thermally-operated means which is exposed to the steam when
the water-level falls below a certain limit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
504.1 for fusible controls.
SEE OR SEARCH CLASS:
340, Communications: Electrical, 500 for electrical
automatic condition responsive indicating systems.
Subclass:
504.3
This subclass is indented under subclass 504. Subject matter
relating to devices controlled by fusible means for admitting
steam or water to the firebox or otherwise extinguishing or
dampening fire.
SEE OR SEARCH CLASS:
220, Receptacles, subclasses 89.1-89.4 for frangible or
fusible receptacle attachments.
Subclass:
505
This subclass is indented under subclass 504. Subject matter
relating to float controlled devices for admitting steam or
water to the firebox or for otherwise extinguishing or
dampening the fire.
SEE OR SEARCH CLASS:
169, Fire Extinguishers, for fire extinguishers, per se.
236, Automatic Temperature and Humidity Regulation, subclass
56 for related art.
Subclass:
506
This subclass is indented under subclass 504. Subject matter
relating to devices for extinguishing or dampening the fire
of the boiler when a certain pressure inside the boiler is
attained. This includes combined safety valves and fire
extinguishers.
Subclass:
507
This subclass is indented under subclass 504. Subject matter
relating to boilers with valves that close automatically when
some part of the boiler bursts in order to prevent steam or
water from escaping.
SEE OR SEARCH THIS CLASS, SUBCLASS:
364 for hand operated valves for closing tubes and headers.
SEE OR SEARCH CLASS:
96, Gas Separation: Apparatus, 408 for gas separation
apparatus having automatic control means for regulation of
separated constituent discharge.
Subclass:
508
This subclass is indented under the class definition.
Subject matter relating to the structure of the steam
receiving and storing chambers for boilers with which the
steam main communicates which do not come within the
definition of other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
88 and 305, for steam and water drums for water tube
boilers.
463 and 509, for steam collecting chambers located within
the body of the boiler.
486 for steam domes or chambers having means for
superheating the steam.
Subclass:
509
This subclass is indented under the class definition.
Subject matter relating to boilers provided with a steam
chamber or receiver inside the boiler below the water line.
SEE OR SEARCH THIS CLASS, SUBCLASS:
36 and 463, for special combinations.
Subclass:
510
This subclass is indented under the class definition.
Subject matter relating to mechanism and structure for
supporting boilers of various types when the structure of the
boiler or the general arrangement is claimed in combination
with the support.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11 and 12, for rotatably supported boilers.
450 for normally supported boilers for regulating the feed
water or heat generation.
SEE OR SEARCH CLASS:
110, Furnaces, 336 for structure of furnace walls.
Subclass:
511
This subclass is indented under the class definition.
Subject matter relating to the structure of tubes and flues
for boilers not of general application and their connection
with the boiler and couplings for tubes or flues, not
specially provided for in other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
360 and 365, for tube couplings for headers and drums and
the structure of the headers and drums.
SEE OR SEARCH CLASS:
110, Furnaces, 322 for protecting devices for the ends of
boiler tubes.
138, Pipes and Tubular Conduits, for tubes of general
utility.
165, Heat Exchange, 177 for a tubular structure of more
general utility specialized to heat exchange.
285, Pipe Joints or Couplings, 189 for couplings for tubes
of boilers and condensers or feed-water heaters to the tube
sheet.
Subclass:
512
This subclass is indented under the class definition.
Subject matter relating to structure of the tube sheet for
boilers not of general application.
SEE OR SEARCH THIS CLASS, SUBCLASS:
365 for drums and couplings.
511 for tubes and connectors.
FOREIGN ART COLLECTIONS
The definitions below correspond to abolished subclasses from
which these collections were formed. See the Foreign Art
Collection schedule of this class for specific
correspondences. {Note: The titles and definitions for
indented art collections include all the details of the
one(s) that are hierarchically superior.}
Subclass: FOR 100
STAND BOILER: Foreign art collection for subject matter
relating to closed water chambers, tanks or receptacles
usually known in the art as "range" or "stand" boilers,
whose structure is modified for the purposes of applying heat
directly to the boiler.
Subclass: FOR 101
Electric: Foreign art collection for devices where the means
to apply heat is an electric heater.
Subclass: FOR 102
Fluid fuel: Foreign art collection for stand boilers heated
by fluid fuel.
Subclass: FOR 103
Solid fuel: Foreign art collection for stand boilers having a
solid fuel furnace forming a part of the unitary structure of
the stand boiler.
Subclass: FOR 104
Fluid fuel, fire tube and water tube: Foreign art collection
for stand boilers provided with both fire tubes and water
tubes adapted to be heated by a fluid fuel burner.
Subclass: FOR 105
Fluid fuel, fire tube: Foreign art collection for stand
boilers provided with fire tubes and heated by a fluid fuel
burner.
Subclass: FOR 106
Fluid fuel, water tube below boiler: Foreign art collection
for stand boilers provided with water tubes located below the
boiler and heated by a fluid fuel burner.
Subclass: FOR 107
Fluid fuel, water tube casing: Foreign art collection for
stand boilers provided with water tubes and surrounded by a
casing and heated by a fluid fuel burner.
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