US Patent Class 123
INTERNAL-COMBUSTION ENGINES-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
1 R  DF  MISCELLANEOUS {1}
2  DF  COMBINED DEVICES {1}
200  DF  ROTARY {12}
18 R  DF  OSCILLATING PISTON {1}
19  DF  LIQUID PISTON
21  DF  CONVERTIBLE CYCLE
22  DF  INTERNAL COMBUSTION AND AIR
23  DF  SOLID FUEL
24 R  DF  GUNPOWDER {1}
25 R  DF  WATER AND HYDROCARBON {15}
26  DF  ADDITIONAL AIR SUPPLY
250  DF  ENGINE MEANS HAVING INTERNAL VAPORIZING IN PRECHAMBER WITH ALL COMBUSTION IN MAIN CHAMBER {2}
253  DF  PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES {22}
294  DF  COMBUSTION CHAMBER MEANS HAVING FUEL INJECTION ONLY {9}
27 R  DF  BURNING BY HIGHLY COMPRESSED AIR {2}
*  DF  OIL ENGINES {1}
37  DF  MULTIPLE EXPLOSION
38  DF  ATMOSPHERIC
39  DF  NONCOMPRESSION
41 R  DF  REVERSIBLE {1}
41.01  DF  COOLING {27}
41.86  DF  CRANKCASE VENTILATION
42  DF  OSCILLATING CYLINDER
43 R  DF  ROTATING CYLINDER {4}
45 R  DF  ROTARY RECIPROCATING PISTON {1}
46 R  DF  FREE PISTON {5}
47 R  DF  VALVED PISTON {3}
48 R  DF  ADJUSTABLE COMBUSTION CHAMBER {5}
50 R  DF  RECIPROCATING CYLINDER {2}
51 R  DF  MULTIPLE PISTON, COMMON NONRESTRICTIVE COMBUSTION CHAMBER {2}
52.1  DF  MULTIPLE CYLINDER {7}
*  DF  DOUBLE-ACTING {2}
64  DF  SIX-CYCLE
65 R  DF  TWO-CYCLE {24}
306  DF  MEANS TO WHIRL FLUID BEFORE, UPON, OR AFTER ENTRY INTO COMBUSTION CHAMBER {3}
310  DF  COMBUSTION CHAMBER HAVING MULTIPLE SPARK GAPS
311  DF  FOUR-CYCLE {19}
319  DF  ENGINE SPEED REGULATOR {16}
406.11  DF  SPARK IGNITION TIMING CONTROL {5}
429  DF  COMBUSTION CHAMBER MEANS COMBINED WITH AIR-FUEL MIXTURE FORMING MEANS {3}
434  DF  CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29}
594  DF  HIGH TENSION IGNITION SYSTEM {28}
90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
143 R  DF  IGNITERS {6}
192.1  DF  VIBRATION COMPENSATING DEVICE {1}
197.1  DF  TRANSMISSION MECHANISM FROM PISTON {3}
179.1  DF  STARTING DEVICE {18}
184.21  DF  INTAKE MANIFOLD {8}
142.5 R  DF  WITH HEATING MEANS {1}
657  DF  COMBUSTION CHAMBER {11}
193.1  DF  PARTICULAR PISTON AND ENCLOSING CYLINDER CONSTRUCTION {3}
188.1  DF  VALVE {10}
195 R  DF  FRAME CONSTRUCTION {8}
196 R  DF  LUBRICATORS {7}
198 R  DF  ACCESSORIES {10}
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FOREIGN ART COLLECTIONS
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*  DF  STARTING DEVICE {1}
FOR 101  DF  SPARK IGNITION TIMING CONTROL (123/406) {16}
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DIGESTS
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DIG 1  DF  Interchangeable
DIG 2  DF  Accumulated fuel return to tank or engine-induction system
DIG 3  DF  Model
DIG 4  DF  Stratification
DIG 5  DF  Crankcase pressure-operated pumps
DIG 6  DF  Detachable
DIG 7  DF  Convertible
DIG 8  DF  Multiple engine units
DIG 9  DF  Flame ignition
DIG 10  DF  Fluidic amplifier fuel control
DIG 11  DF  Antidieseling (stopping)
DIG 12  DF  Hydrogen
DIG 13  DF  Gas