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

Class
261
GAS AND LIQUID CONTACT APPARATUS

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> GAS AND LIQUID CONTACT APPARATUS
1		MISCELLANEOUS
2		WITH LIQUID SEPARATIONS
3		. In circuit
4		. On inlet
5		. Filtering
6		. . Unitary structure
7		. Decanting
8		. . Unitary structure
127		WITH EXTERNAL SUPPLY OR REMOVAL OF HEAT
128		. Processes
129		. Temperature or humidity sensor
130		. . Heat supply or removal control
131		. Automatic control of heat supply or heat effect
133		. With mixer for supplementary gas and gaseous contactor product
134		. . Pressure responsive supplementary gas supply means
135		. With indicator or tester
136		. Combined
137		. Interconnected heat supply and contact fluid flow controllers
138		. Diverse heat supply or removal means
139		. . Electric heater
140.1		. Refrigeration producer
140.2		. . Absorption means
141		. Heat producer
142		. . Electric heater
143		. . Means burning contact product
144		. . . Internal combustion engine
145		. . . . Engine fuel supply means heated by exhaust manifold
146		. Plural distinct contact zones
147		. . Serially arranged in flow path
148		. . . Counter flowing gas and liquid (e.g., absorption or rectification column)
149		. . . Heat exchanger in flow path spaced from contact zones
150		. Heat exchange means in one of plural liquid feed paths
151		. Recirculating fluid
152		. Heat exchange means at or downstream of contact zone
153		. . Gas exposed liquid body or sheet contacting heat exchanger
154		. . Porous type gas-liquid contactor exposed to heat exchanger
155		. . Contact fluid passage surrounds external fluid flow passage
156		. . Fins or deflectors in contact fluid passage of heat exchanger
157		. . With heat exchange means for feed fluid
158		INDIRECT INTERCHANGE OR HEAT BETWEEN CONTACT FLUIDS
159		. Incoming fluid exchanges heat
160		. . With fluid at or downstream of contact zone
161		. . . Incoming exchanging fluid is feed gas
16		MULTIPLE GAS
17		. Furnace-gas type
18.1		MULTIPLE DIVERSE LIQUIDS
18.2		. Water added to charge
18.3		. Multiple fuels
18.4		. Antidetonant
19		FLUID DISTRIBUTION
20		. Systems
21		. . Series
22		. . . Gas connections
23.1		. . Parallel
23.2		. . . Carburetors
23.3		. . . . Stratified charge
23.4		. . . . Rotary engine
24		. Pumping
25		. . Liquid operated
26		. . Automatic control
27		. . . Liquid inlet
28		. . Gas and liquid
29		. . . Liquid circuit
30		. . Gas inlet
31		. . . Churn type
32		. . . . Rotary dasher
33		. . . . Reciprocating dasher
34.1		. . Liquid
34.2		. . . Accelerator pump
34.3		. . . . With thermostatic control
35		. . . Gas operated
36.1		. . . In circuit
36.2		. . . . Carburetor
37		. . . Inlet
38		. Valved
39.1		. . Thermostatic
39.2		. . . With carburetor expansible fluid actuating means
39.3		. . . With carburetor bimetallic actuating means
39.4		. . . Carburetor spring linkage with temperature element
39.5		. . . Without carburetor choke means
39.6		. . . With carburetor electrical heater
40		. . Multiple jet
41.1		. . . Progressive
41.2		. . . . With parallel carbureting passages
41.3		. . . . . With control of plural passages
41.4		. . . . Multiple jet manual control
41.5		. . . . Bypass opening beyond throttle
42		. . Multiple valves
43		. . . Connected
44.1		. . . . Contact space
44.2		. . . . . Contact valve with hollow shaft supplying liquid
44.3		. . . . . Traversely reciprocating air or mixture valve
44.4		. . . . . . Suction operated
44.5		. . . . . Longitudinally movable air or mixture valve
44.6		. . . . . Rotating air or mixture valve
44.7		. . . . . . Off-center pivoted
44.8		. . . . . . Cylinder or plug-valve type
44.9		. . . . . Variable-shape passage
45		. . . . Gas by-pass
46		. . . . . With gas inlet
47		. . . . . With gas outlet
48		. . . . . With liquid inlet
49		. . . . Liquid inlet
50.1		. . . . . With gas inlet
50.2		. . . . . . Suction operated gas inlet valve
50.3		. . . . . . Noncarburetor
51		. . . . . With gas outlet
52		. . . . Gas inlet and outlet
53		. . . Contact space
54		. . . Gas by-pass
55		. . . . With gas inlet
56		. . . . With gas outlet
57		. . . . With liquid inlet
58		. . . Liquid inlet
59		. . . . With gas inlet
60		. . . . With gas outlet
61		. . . Gas inlet and outlet
62		. . Contact space
63		. . Gas by-pass
64.1		. . Gas inlet
64.2		. . . Anterior throttle
64.3		. . . Pressure control
64.4		. . . Suction operated
64.5		. . . Float control
64.6		. . . Starting choke
65		. . Gas outlet
66		. . Liquid inlet
67		. . . Plural
68		. . . . Float and manual
69.1		. . . Gas pressure controlled
69.2		. . . . Wet diaphragm
70		. . . Float controlled
71		. . . Manual
72.1		. Liquid supply tank
72.2		. . Aviation carburetor
73		. . Barometric
74		. Contact receptacle
75		CONTACT DEVICES
76		. Injector type
77		. . Submerged blast
78.1		. Atomizer type
78.2		. . Noncarburetor
79.1		. Rotating gases
79.2		. . Noncarburetor
80		. Traveling strip
81		. Reciprocating
82		. . Piston
83		. Rotating
84		. . Impeller
85		. . . Hollow shaft
86		. . . . Gas trapping
87		. . . . Gas delivering
88		. . . . Liquid spraying
89		. . . Sprayed
90		. . . . Horizontal axis
91		. . . Dipping
92		. . . . Horizontal axis
93		. . . Submerged blast
94		. Porous mass
95		. . Surface contact
96		. . Gas-flow control
97		. . Liquid-flow control
98		. . . Spray
99		. . . Capillary feed
100		. Porous sheet
101		. . Surface contact
102		. . . Gas-flow control
103		. . . Liquid downflow
104		. . . Capillary feed
105		. . Gas-flow control
106		. . Liquid downflow
107		. . Capillary feed
108		. Wet baffle
109		. . Gas-flow control
110		. . Liquid-flow control
111		. . . Spray
112.1		. . . Film
112.2		. . . . Corrugated plates
113		. . Perforated baffles
114.1		. . Overflow baffles
114.2		. . . Bubble caps
114.3		. . . Jet plates
114.4		. . . Valve tray
114.5		. . . Tray construction
115		. Liquid spray
116		. . Aspirating
117		. . Opposed
118		. . Transverse
119.1		. Liquid tank
119.2		. . Carburetor
120		. . Floating distributor
121.1		. . Submerged blast
121.2		. . . Minnow bucket
121.3		. . . Carburetor vented nozzle
121.4		. . . . Air inlet valve
122.1		. . . Submerged screen
122.2		. . . . With closable apertures
123		. . . Submerged baffle
124		. . . Multiple jet
125		. . Multiple receptacle
126		. . Upflowing gases
		*****************************
		DIGESTS
		*****************************
DIG 1		Auxiliary air inlet carburetors
DIG 2		Airplane
DIG 3		Air cooling
DIG 4		Auto humidifiers
DIG 6		Backfire
DIG 7		Carbonators
DIG 8		Carburetor primers
DIG 9		Furnace gas scrubbers
DIG 10		Steam heaters and condensers
DIG 11		Cooling towers
DIG 12		Carburetor venturi
DIG 13		Desuperheaters
DIG 14		Display stands
DIG 15		Duct humidifiers
DIG 16		Cream whipping
DIG 17		Odorizers
DIG 18		Dashpots
DIG 19		Degassers
DIG 20		Deicers for carburetors
DIG 21		Drawing excess fuel from carbureting passage
DIG 22		Faucet aerators
DIG 23		Fuel feeding valves
DIG 24		Fuel feeding valve retaining
DIG 25		Fuel spread out into a film
DIG 26		Foam
DIG 27		Gas circulated in circuit
DIG 28		Blood oxygenators
DIG 29		Heaters submerged in liquid
DIG 30		Tray heaters
DIG 31		Heaters
DIG 32		Heaters and condensers
DIG 33		Heaters, spray
DIG 34		Automatic humidity regulation
DIG 35		Air line lubricators
DIG 36		Carburetor manifolds
DIG 37		Modern pumps diaphragm
DIG 38		Needle valves
DIG 39		Liquid feeding nozzles
DIG 40		Oil filter for fuel entering nozzles or float chamber
DIG 41		Pad retaining means in humidifiers and air conditioners
DIG 42		Ozonizers
DIG 43		Air coolers
DIG 44		Overflow trough
DIG 45		Processes carburetors
DIG 46		Residue prevention in humidifiers and air conditioners
DIG 47		Swing diffusers
DIG 48		Sonic vibrators
DIG 49		Suction operated feed valve
DIG 50		Surge prevention in carburetors
DIG 51		Carburetors with supercharging blowers
DIG 52		Carburetor with valves
DIG 53		Valve actuation
DIG 54		Venturi scrubbers
DIG 55		Reatomizers
DIG 56		Variable venturi
DIG 57		Interchangeable chore tube
DIG 58		Choke tube having plurality of leaves
DIG 59		Choke tube leaves flexible
DIG 60		Duplex barrels
DIG 61		Longitudinally reciprocating choke tube (along air passage)
DIG 62		Longitudinally reciprocating choke tube having movable parts
DIG 63		Longitudinally reciprocating choke tube, throttle-operated
DIG 64		Longitudinally reciprocating choke tube, suction-operated
DIG 65		Vaporizers
DIG 66		Water injection to prevent detonation
DIG 67		Carburetors with vented bowl
DIG 68		Diaphragm-controlled inlet valve
DIG 69		Fluid amplifiers in carburetors
DIG 70		Sewage aerators; diffusers
DIG 71		Sewage aerators; rotating
DIG 72		Packing elements
DIG 73		Carburetor primers; ticklers
DIG 74		Valve actuation; electrical
DIG 75		Flowing liquid aspirates gas
DIG 76		Steam
DIG 77		Plume abatement
DIG 78		Sonic flow
DIG 79		Cooling ponds
DIG 80		Electrical treatment
DIG 81		Percolation control
DIG 82		Upper end injectors
DIG 83		Fuel vapor generation
DIG 84		Tamperproof
DIG 85		Droplet catchers
DIG 86		Cooling tower ice prevention
DIG 87		Cooling tower power generators
DIG 88		AROMA DISPENSERS
DIG 89		. Electrically heated aroma dispensers

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

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Last Modified: 6 October 2000