US Patent Class 203
DISTILLATION: PROCESSES, SEPARATORY-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
1  DF  WITH MEASURING, TESTING OR INSPECTING {2}
4  DF  INCLUDING PURGING OF THE SYSTEM
5  DF  SEPARATING ISOTOPES OR TAUTOMERS
6  DF  ADDITION OF MATERIAL TO DISTILLAND TO INHIBIT OR PREVENT REACTION OR TO STABILIZE {2}
10  DF  WATER PURIFICATION ONLY {1}
12  DF  DISTILLING TO SEPARATE OR REMOVE ONLY WATER {2}
20  DF  INCLUDING DEFOAMING OR INHIBITING FOAM
21  DF  AND RECOVERING HEAT BY INDIRECT HEAT EXCHANGE {3}
28  DF  WITH CHEMICAL REACTION {1}
39  DF  WITH DISPARATE PHYSICAL SEPARATION {5}
49  DF  CONVECTIVE DISTILLATION WITH NORMALLY GASEOUS MEDIUM, E.G., AIR
50  DF  ADDING MATERIAL TO DISTILLAND EXCEPT WATER OR STEAM PER SE {2}
71  DF  PLURAL DISTILLATIONS PERFORMED ON SAME MATERIAL {5}
86  DF  DISTILLATION IN APPARATUS OR ELEMENT OF SPECIFIC MATERIAL
87  DF  WITH FRACTIONAL CONDENSATION OF VAPOR OUTSIDE STILL
88  DF  FLASH VAPORIZATION OF DISTILLAND
89  DF  FILMING OF DISTILLAND FOR VAPORIZATION
90  DF  SPRAYING OF DISTILLAND INTO VAPORIZATION ZONE
91  DF  VAPORIZATION ZONE UNDER POSITIVE PRESSURE OR VACUUM {2}
95  DF  INCLUDING ADDITION OF WATER OR STEAM {2}
98  DF  AND RETURNING PRODUCT OF DISTILLATION STEP TO DISTILLATION ZONE
99  DF  MISCELLANEOUS SEPARATORY
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CROSS-REFERENCE ART COLLECTION
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100  DF  PARTICULAR TYPE OF HEATING
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DIGESTS
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DIG 1  DF  Solar still
DIG 2  DF  Laboratory distillation
DIG 3  DF  Acrylonitrile
DIG 4  DF  Heat pump
DIG 5  DF  Human waste
DIG 6  DF  Reactor-distillation
DIG 7  DF  Start up or shut down
DIG 8  DF  Waste heat
DIG 9  DF  Plural feed
DIG 10  DF  Vinyl acetate
DIG 11  DF  Batch distillation
DIG 13  DF  Spirits
DIG 14  DF  Ejector-eductor
DIG 16  DF  Combination
DIG 17  DF  Saline water conversion
DIG 18  DF  Control
DIG 19  DF  Sidestream
DIG 20  DF  Power plant
DIG 21  DF  Acrylic acid or ester
DIG 22  DF  Accessories
DIG 23  DF  Methanol
DIG 24  DF  Mobile, marine distiller
DIG 25  DF  Non-distilling bottoms treatment