Class 122: LIQUID HEATERS AND VAPORIZERS ( Manual of U.S. Patent Classification )

U.S. PATENT AND TRADEMARK OFFICE
Information Products Division

[Manual of Classification, Class Listing]

Manual of U.S. Patent Classification
as of June 30, 2000

Class
122
LIQUID HEATERS AND VAPORIZERS

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Subclass		Title
ClassTitle		===> LIQUID HEATERS AND VAPORIZERS

1R		PLANTS
2		. Garbage
3		. Motor vehicle
1A		. Air heaters
1B		. Once through
1C		. Feed water heaters
4R		MISCELLANEOUS
4A		. Electric boiler
4C		. Water-cooled stoker
4D		. Catalyst
5		GAS-PRODUCER
5.51		AIR-INJECTED
5.52		. Combustion gas and vapor contact
6R		INDUSTRIAL
6.5		. Port
6.6		. Tuyeres
6.7		. . Forge
7R		. Waste heat
7A		. . Steel converter
7B		. . Additional burner
7C		. . Waste sulfite
7D		. . Carbon monoxide
8		. Water firebox
9		. . Water tube type
6A		. Water-cooled walls
6B		. Bosh plates
6C		. Skew arch coolers
10		FOR FLUID FUEL BURNER
11		ROTARY
12		ROTATABLY SUPPORTED
13.01		STAND BOILER (E.G., WATER HEATER, ETC.)
13.3		. And delivery means to dispensing feature
14.1		. And condition responsive feature
14.2		. . Controls burner
14.21		. . . By other than temperature of water
14.22		. . . By temperature of water in a water containing chamber or external tank
14.3		. . Having water flow control feature
14.31		. . . Using valve actuated by flow or pressure (e.g., check valve, etc.)
15.1		. Heated by liquid or steam (e.g., indirect heating, etc.)
16.1		. Solid fuel burner
17.1		. Fluid fuel burner
17.2		. . Liquid fuel burner
18.1		. . Having heat exchange feature
18.2		. . . Preheater
18.3		. . . Fire tube or flue surrounded by water containing chamber
18.31		. . . . Penetrates one side of water chamber to another
18.4		. . . Water tube surrounded by burned fuel
18.5		. . And external water tank
19.1		. Water containing chamber or external tank having circulation feature within
19.2		. And casing feature for stand boiler or external water tank therefor
20R		SUBSIDIARY
20A		. Subsidiary-heater firebox
20B		. Subsidiary-heater offtake flue
29		ANNULAR FIREBOX
30		MAGAZINE
		INDIRECTLY HEATED
		. Separate fluid
32		. . Surface
33		. . . Furnace
34		. . . Separator
31.1		INDIRECTLY HEATED SEPARATE INJECTED FLUID
31.2		. Submerged flame
35		ACCUMULATOR
36		AUXILIARY STEAM HEATER
37		COMPARTMENT
		. Auxiliary
38		. . Draft regulator
39		FILM
40		FLASHER
41		. Fluid fuel
42		FIRE AND WATER TUBE
43		. Fluid fuel
44.1		FIRE TUBE
44.2		. With baffle in flue
49		. Horizontal and vertical
		. Horizontal or inclined
		. . Water firebox
50		. . . Flue
51		. Horizontal
52		. . Plural
53		. . . Water tube
		. . Central firebox
54		. . . Double outlet
55		. . Cylinder
		. . Depending fire tube
56		. . . Rear of bridge wall
		. . Double water firebox
57		. . . Alternate smoke return
58R		. . Drop water firebox
59		. . . Circulation conduit
		. . . Double
60		. . . . Alternate smoke return
61		. . . Drop water baffle
62		. . . Front and rear water baffle
63		. . . Front water baffle
64		. . . Interposed combustion chamber
65		. . . Rear water baffle
66		. . . Water coking chamber
		. . . Water grate
67		. . . . Intermediate draft
68		. . . Water tube
		. . . . Feed heater
69		. . . . . Check-valved
70		. . . . Feeding air
71		. . . . Solid baffle
58FB		. . . Fire box construction
72		. . Projecting into firebox
73		. . . Drop water firebox
		. . Return and reverse
74		. . . Drop water firebox
75		. . Return fire tube
76		. . . Drop water firebox
77		. . . . Internal water tube
		. . . Water firebox
78		. . . . Flue
79		. . Subjacent water arch
80		. . Subjacent flue
81		. . Subjacent transverse fire tube
		. . Superjacent feed heater
82		. . . In communication
83		. . Transverse diaphragm
		. . Two diameters
84		. . . Great diameter over firebox
85		. . . Small diameter over firebox
86		. . . . Water firebox
87		. . U-coupling
88		. . Upper drum
		. . Water arch
89		. . . Rear of fire tube
90		. . Water firebox
		. . . Firebox water heater
91		. . . . Trapped circuit
92		. . . Magazine
93		. . . Offset
94.1		. . . . Water tube type
95.1		. . . Plural with common combustion chamber
95.2		. . . . Multiboilers
96		. . . Superposed
		. . . Water grate
97		. . . . Downdraft
98		. . . . Updraft
		. . . Water tube
99		. . . . Straddle
		. . . Water tube type
100		. . . . Interposed flue
101		. . Water smoke box
		. . Water tube
		. . . Horizontal
102		. . . . Over bridge wall
103		. . . Rear of fire tube
		. . . Rearwardly declined
104		. . . . Over bridge wall
		. . . Rearwardly inclined
105		. . . . Over bridge wall
106		. . Water wall
107		. . . Drop water firebox
108		. . . Subjacent water tube
109		. Inclined
		. Transverse
110		. . Horizontal boiler
111		. . Vertical boiler
112		. . . Water firebox
113		. . Water tube
114		. Vertical
116		. . Central fire dome
117		. . Central magazine
		. . Circulation tube
118		. . . Internal
119		. . Cylinder
120		. . Offset firebox
121		. . Return fire tube
122		. . . Water firebox
123		. . Separate compartment
124		. . Side magazine
125		. . Top water chamber
126		. . Water firebox
127		. . . Annular
128		. . . Central magazine
		. . Water grate
129		. . . Downdraft
130		. . Water tube
131		. . . Internal
132		. . . Radial loop
133		. . . Spur
115		. . Fluid fuel
134		. Volute
46		. Magazine
		. Flue
47		. . Horizontal
48		. . Vertical
45		. Fluid fuel
135.1		FLUE
135.2		. Alternative stack
135.3		. Sinusoidal flue
136R		. Horizontal
137		. . Plural
138		. . . Water tube
139		. . Drop water firebox
140.1		. . Internal water tube
140.2		. . . Having water tube in flue
		. . . Longitudinal
141		. . . . Drop water firebox
142		. . . Return fire tube
143		. . . Spur
144		. . . Subjacent firebox
145		. . . Transverse
146		. . . . Drop water firebox
147		. . . . Return fire tube
148		. . . Water firebox
149		. . Return fire tube
150		. . . Rear water tube
		. . . Water smoke box
151		. . . . Separate
152		. . Water grate in flue
153		. . Water tube
154		. . . Over bridge wall
136C		. . Horizontal-corrugated or finned
155.1		. Vertical
155.2		. . With flue baffle
155.3		. . Having exterior heating flue
155.4		. . Having corrugated flue
155.5		. . Having undulating flue
157		. . Central magazine
158		. . . Water jacket
		. . Circulation tube
159		. . . Internal
160		. . Concentric shell
161		. . . Fluid fuel
162		. . . Central magazine
163		. . Exterior drum
165		. . Internal water heater
166.1		. . With internal water tube
166.2		. . . Loop-type tube
168		. . . Central magazine
169		. . . Coil
170		. . . . Header
171		. . . Contracted inlet
172		. . . Header
173		. . . Horizontal spur
174		. . . Internal fire tube
175		. . . Offset water firebox
176		. . . Transverse
177		. . . . Fluid fuel
178		. . . Vertical aligned fire tube
179		. . . . Fluid fuel
180		. . . . Spur water tube
181		. . . Vertical spur
167		. . . Fluid fuel
182.1		. . With return fire tube
182.2		. . . Having symmetrical arrangement of tubes
182.3		. . . Having tubes offset from firebox
		. . Spiral water conduit
183		. . . Fluid fuel
		. . Standpipe
		. . . Water tube
184		. . . . Annular firebox
185		. . . . Loop
186		. . . . Spur
187		. . Transverse fire tube
164		. . Insulated outlet flue
156		. . Fluid fuel
		HORIZONTAL CYLINDER
188		. Drop water baffle
		. Offset subjacent firebox
189		. . Water roof
190		. . Water tube
		. Subjacent fire tube
191		. . Beyond bridge wall
192		. Water bridge wall
193		. Water firebox
194		. . Water tube type
195		. Water tube
		. . Feed heater
196		. . . Check-valved
197		. . Lateral-longitudinal
198		. . Lateral-vertical
199		. . . Firebox
200		. . Over fuel grate
201		. . Subjacent internal fire tube
202		. . Trapped circuit
		. . Water grate
203		. . . Downdraft
204		. . . Intermediate draft
205		. . . Multiple series
206		. . . Solid and water bar
207		. . . Updraft
		PLATE
		. Zigzag conduit
208		. . Fluid fuel
209.1		SECTIONAL
209.2		. Feeding air
213		. Plural firebox
		. Horizontal sections
214		. . Superimposed
215		. . . Central connection
216		. . . . Fluid fuel
217		. . . . Water firebox
218		. . . Water firebox
219		. . . . Central magazine
		. . . Water tube
		. . . . Internal fire tube
220		. . . . . Water firebox
		. Vertical sections
221		. . Annularly positioned
222		. . . Central magazine
223		. . Longitudinally positioned
224		. . . Casing
225R		. . Transversely positioned
226		. . . Casing
227		. . . . Divided section
228		. . . Divided section
229		. . . Water grate
225A		. . . Water heater in flue
225B		. . . Water heater in boiler
225F		. . . Feeding air
230		. . Two-section
212.1		. With magazine
212.2		. . With return or alternate flue
211		. Fluid or solid fuel
210		. Fluid fuel
232		. Water grate
231		. Accessories
		TANK
233		. Horizontal
234		. Vertical
235.11		WATER TUBE
235.12		. Wall structure
235.13		. With fuel burners having posts and tuyeres
235.14		. Tube structure
235.15		. Headers and connections
235.16		. For plural fluids
235.17		. Having baffles
235.18		. Having seals
235.19		. D-type tube
235.21		. . Multiple D-type tubes
235.22		. Wall loop
235.23		. Having specific tube patterns
235.24		. Screens
235.25		. . Floor screens
235.26		. Having slag and ash disposal
235.27		. Locomotive-type
235.28		. Having rotary flame
235.29		. Having forced circulation system
235.31		. Having specific intenal drum and head structure
235.32		. With combustion
235.33		. With convection zone regulation
235.34		. With parallel multiple fireboxes
235.35		. With serial multiple fireboxes
238		. Offset firebox
239		. Superimposed firebox
240.1		. Having plural fireboxes
240.2		. . Series connected
240.3		. . Parallel connected
241		. Firebox in drum
242		. Capillary
243		. . Fluid fuel
		. Coil or loop
244		. . Central standpipe
245		. . . Fluid fuel
246		. . . Annular firebox
247		. Coil
		. . Horizontal
248		. . . Fluid fuel
249		. . Vertical
250R		. . . Fluid fuel
250S		. . . . Standpipe
251		. . . Central magazine
252		. . . Water firebox
253		. Cross
254		. . Over bridge wall
		. . Over firebox
		. . . Longitudinal
		. . . . Header
255		. . . . . Drum
		. . . Transverse
		. . . . Header
256		. . . . . Drum
		. . Transverse
		. . . Header
257		. . . . Drum
258		. Downflow
259		. Drum type
260		. Flat
261		. . Volute
262		. Horizontal
263		. . Over bridge wall
264		. . Over firebox
265		. Inclined
266		. Internal fire tube
267		. . Horizontal
268		. . Inclined
269		. . Plural fire tube
270		. . Straddle
271		. . Vertical
272		. . . Central magazine
273		. Longitudinal upper drum
274		. . Fluid fuel
275		. Loop
276		. . Firebox enclosing
277		. . Over bridge wall
		. . Over firebox
278		. . . Cross
279		. . . Horizontal
		. . . Rear of bridge wall
280		. . . . Bridge wall header
281		. . . Standpipe
282		. . . Vertical
283		. . . . Fluid fuel
		. Over bridge wall
284		. . Headers at right angles
285		. . Transverse water baffle
		. . Water grate
286		. . . Downdraft
287		. . . Intermediate draft
		. Over firebox
288		. . Headers at right angles
		. . Water grate
289		. . . Updraft
		. Rearwardly declined
		. . Over bridge wall
290		. . . Front and rear header
291		. . . . Horizontal-longitudinal drum
292		. . . . . Firebox tube
293		. . . . . Longitudinal water baffle
294		. . . . . Water wall
295		. . . . Internal water tube
296		. . . . Longitudinal-declined drum
297		. . . . Transverse drum
		. . Over firebox
		. . . Front and rear header
298		. . . . Horizontal-longitudinal drum
299		. . . . Transverse drum
300		. . . . Tubes beyond side wall
		. . Plural upper transverse drum
301		. . . Plural lower transverse drum
302		. . . Single lower transverse drum
		. Rearwardly inclined
		. . Over firebox
		. . . Front and rear header
303		. . . . Transverse drum
		. Separate banks
304		. . Opposite fireboxes
305		. Spur
306		. . Bridge wall header
307		. . Central standpipe
308		. . . Fluid fuel
309		. . . Annular firebox
310		. . . Central magazine
311		. . Cross
312		. . Horizontal-longitudinal drum
313		. . Over bridge wall
		. . Over firebox
314		. . . Central header
315		. . . Declined
316		. . . Horizontal
317		. . Straddle
318		. . Vertical
319		. . . Fluid fuel
320		. . . Central magazine
321		. Standpipe
322		. . Fluid fuel
323		. . Annular firebox
324		. Straddle
		. . Plural upper drum
325		. . . Plural lower drum
326		. . . . Cross
		. . Single upper drum
327		. . . Plural lower drum
328		. . . . Fluid fuel
329		. . . . Cross
330		. . . . Plural firebox
331		. Transverse horizontal drum
332		. Vertical
333		. . Fluid fuel
334		. . Side magazine
335		. . Annular firebox
336		. . Offset firebox
337		. . . Elevated
		. . Annular lower drum
338		. . . Annular upper drum
339		. . . . Central magazine
340		. . . . Tubes over firebox
341		. . . Fire tube upper drum
342		. . . Spur tube upper drum
343		. . . Upper drum
344		. . . . Central magazine
345		. . Beyond bridge wall
346		. . . Gas return
		. . . Longitudinal upper drum
347		. . . . Longitudinal lower drum
		. . Internal fire tube
348		. . . Fluid fuel
349		. . Over firebox
350		. . . Gas return
		. . Plural upper longitudinal drum
351		. . . Plural lower longitudinal drum
		. . Plural upper transverse drum
		. . . Plural lower transverse drum
352		. . . . Offset firebox
353		. Water grate
354		. . Downdraft
355		. Zigzag
356		. . Fluid fuel
		. . Over bridge wall
357		. . . Longitudinal drum
358		. . . Transverse drum
359		. . Over firebox
237		. Magazine
236		. Fluid fuel
		. Headers
360		. . Closures and couplings
361		. . . Cleaning
362		. . . Concentric tube
363		. . . Drum
364		. . . Tube closures
365		. Drums and couplings
366		WICK
367.1		HEAT TRANSMITTER
367.2		. Double immersed heat transmitters
367.3		. Corrugated and finned heat transmitters
367.4		. Pebble furnaces
368		WATER FIREBOX
369		. Mud ring
370		. Plural
371		WATER GRATE
		. Plural firebox
		. . Superimposed
		. . . Water grate
372		. . . . Updraft
373		. Cage
374		. Grate structure
375		. . Solid and water bar
376		. Progressive feed
		. Water firebox
		. . Solid and water bar
377		. . . Updraft
378		. . Updraft
21		CHEMICAL
22		FLUID AND SOLID FUEL
23		FLUID FUEL
24		. Explosion
		. Plural burner
25		. . Superimposed
26		FRICTION GENERATOR
		NONCOMBUSTIBLE HEATER
27		. Surface
28		. Water in contact
379		CLEANING
380		. Agitating circulator
		. Blow off
381		. . Bottom and surface
382		. . Bottom
383		. . . Internal conduit
384		. . . . Ejector
385		. . . . Mud ring
386		. . . . Pan
387		. . . . Scraper
388		. . . . Valved
389		. . Surface exit
390		. Fluid jet
391		. . Horizontal fire tube boiler
392		. . Water tube boiler
393		. Mud drum
394		. Pans
395		. Sandblast
396		. Systems
397		. Trapped circuit
398		. . Feeding water
399		. . Surface and bottom exit
400		. . Surface exit
401		. . . Chemical feeder
402		. . . Circulating pump
403		. . . Feed heater
404		. . . Steam injector
405		. Wash-out nozzle
406.1		CIRCULATION
406.2		. Having anticavitation devices
406.3		. Having restrictors and orifices
406.4		. Once through
406.5		. With start-up operations
407		. Injector
408.1		. Having internal conduit
408.2		. . With internal geyser tube
409		. . Horizontal flue boiler
410		. . . Return fire tube
		. Mechanical
411		. . Internal
412		FEED HEATERS
413		. Ash pan
		. Boiler circuit
414		. . Feed-injected
		. Circulatioon
		. . Surface exit
		. . . Mechanical pump
415		. . . . Feed-injected
417		. Drip plate in boiler
		. Fire-engine boiler
		. . Auxiliary
418		. . . Attached
419		. . . Detachable
420		. Furnace gases
421		. Offtake flue
422		. Furnace gases and steam
		. Horizontal fire tube boiler
423		. . Smoke box
424		. . . Exhaust pipe
425		. . . Furnace gases and steam
426		. . . Water tube
427		. . Smoke chamber
428		. Internal conduit
429		. . Automatic sediment valve
430		. . Blow-off delivery
431		. . Filter in boiler
432		. . Furnace gases
433		. . Trap outside boiler
434		. Locomotive tender
435		. Pan in steam space
436		. . Spray
437		. Safety valve
438		. Spray to steam space
439		. Stack
441		. Steam
442		. . Injected
		. . . Superposed
443		. . . . Open to steam space
444		. Water tube boiler
		REGULATION
		. Fuel and water
446		. . Fluid fuel
447		. . . Cutoff
		. . Automatic control
449		. . . Solid fuel
450		. Suspended boiler
448.1		AUTOMATIC CONTROL OF FLUID FUEL AND WATER
448.2		. Having fuel or feed bypass
448.3		. Multiple boiler regulation
448.4		. Once through
451R		FEEDERS
		. Automatic
451.1		. . Thermally controlled
451.2		. . . Pressure-operated valve
452		. Boiler pressure
		. Gravity
456		. . Automatic
457		. . . Heater
458		. . Heater
451S		. Once through
459		STEAM TREATMENT
460		. Boilers with superheaters
		. Fire tube boiler
		. . Horizontal
461		. . . Superheater
		. . . . In fire tube
462		. . . . . From smoke box
		. . . . Interior steam space
463		. . . . . Internal fire tube
		. . . . Smoke box
464		. . . . . Fire tube
465		. . . . . Steam tube
466		. . Superheater and feed heater
		. . Vertical
467		. . . Superheater
		. Flue boiler
		. . Vertical
		. . . Internal water tube
468		. . . . Superheater
		. Horizontal boiler
		. . Superheater
469		. . . Rear of firebox
470		. . . Waste-heat flue
		. Water tube boiler
		. . Declined over bridge wall
		. . . Front and rear header
		. . . . Declined drum
471		. . . . . Superheater
		. . . . Longitudinal drum
472		. . . . . Superheater
		. . Longitudinal drum
473		. . . Superheater
		. . Over bridge wall
474		. . . Superheater
		. . Standpipe
		. . . Spur tube
475		. . . . Superheater
		. . Transverse drum
478		. . . Superheater
477		. . Superheater and feed heater
476		. . Superheater
		. Superheater
480		. . Damper-controlled
481		. . Firebox
482		. . Fire tube in steam space
483		. . Indirectly heated
484		. . Separate charges
485		. . Separate furnace
486		. . Steam dome
487		. . Water-injected
479.1		. Automatic heat regulation of superheater
479.2		. . Having gas recirculation
479.3		. . Having flame positioning
479.4		. . With variable firing
479.5		. . Having dampers
479.6		. . Plural furnaces
479.7		. . Once through
		SEPARATORS
488		. Boiler circulation
489		. Boiler return
490		. For tilting boilers
491		. Interior of boilers
492		. Steam dome
493		BRACES AND STAYS
494		CASINGS
495		CROWN SHEETS PROTECTING
496		CROWN SHEETS AND STAYS
497		FRONTS
498		. Doors
499		. Mouths
500		. . Water firebox
501		FLUID-DISPLACER
502		. Fluid fuel
503		FUEL BAFFLES
504		SAFETY DEVICES
504.1		. Fusible control
504.2		. Alarms or indicators
		. Fire extinguishers
504.3		. . Fusible control
505		. . Float-controlled
506		. . Pressure-controlled
507		. Self-closing valve
508		STEAM DOMES
509		SUBMERGED STEAM CHAMBER
510		SUPPORTS
511		TUBES AND CONNECTIONS
512		TUBE SHEETS
		*********************************
		FOREIGN ART COLLECTIONS
		*********************************
		Any foreign patents/nonpatent literature from subclasses that were reclassified have been transferred directly to the art collections listed below. These art collections contain ONLY foreign patents/nonpatent literature. [Note: The parenthetical references in the titles refer to the abolished U.S. classifications from which these art collections were derived].
FOR 100		STAND BOILER (122/13.1)
FOR 101		. Electric (122/13.2)
		. Fire tube and water tube (122/unnumbered)
FOR 102		. . Fluid fuel (122/16)
		. Fire tube (122/unnumbered)
FOR 103		. . Fluid fuel (122/17)
		. Water tube (122/unnumbered)
		. . Below boiler (122/unumbered)
FOR 104		. . . Fluid fuel (122/18)
		. . Casing (122/unnumbered)
FOR 105		. . . Fluid fuel (122/19)
FOR 106		. Fluid fuel (122/14)
FOR 107		. Solid fuel (122/15)
		******************************
		DIGESTS
		******************************
DIG 1		Air heater
DIG 2		Air heater - indirectly heated
DIG 3		Gas flow baffles
DIG 4		Once through boilers
DIG 5		Critical pressure
DIG 6		Damper-directed radiation
DIG 7		Feeding air
DIG 10		Portable units
DIG 11		Removable steam-heating elements
DIG 13		Tubes - composition and protection
DIG 14		Tube replacement
DIG 15		Valves
DIG 16		Welding

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

Manual of U.S. Patent Classification as of June 30, 2000

Class 122 LIQUID HEATERS AND VAPORIZERS

Manual of U.S. Patent Classification
as of June 30, 2000

Class
122
LIQUID HEATERS AND VAPORIZERS