US Patent Class 23
CHEMISTRY: PHYSICAL PROCESSES




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Current as of: June, 1999
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  DF  CLASS NOTES
293 R  DF  PHYSICAL PROCESSES
294 R  DF  .~ Sublimation
294 S  DF  .~.~ Sulfur
295 R  DF  .~ Crystallization
296  DF  .~.~ Selective
297  DF  .~.~.~ With extraction
298  DF  .~.~.~ From natural sources
299  DF  .~.~ With extraction
300  DF  .~.~ With added material
301  DF  .~.~.~ Seed
302 R  DF  .~.~ Alkali metal and ammonium compounds
303  DF  .~.~.~ Common salt
302 A  DF  .~.~.~ Ammonium compounds
302 T  DF  .~.~.~ Sodium compounds
304  DF  .~.~ Alkaline earth metal and magnesium compounds
305 R  DF  .~.~ Heavy metal or aluminum compounds
305 A  DF  .~.~.~ Aluminum compounds
305 F  DF  .~.~.~ Iron compounds
305 RE  DF  .~.~.~ Rare earth compounds
295 G  DF  .~.~ Gel
295 S  DF  .~.~ Solar
306  DF  .~ Concentration of liquids in liquids
307  DF  .~.~ With direct heating
308 R  DF  .~ Melting out
308 S  DF  .~.~ Sulfur
313 R  DF  .~ Agglomerating
314  DF  .~.~ Carbon
313 AS  DF  .~.~ Silicate
313 FB  DF  .~.~ Fluidized bed
313 P  DF  .~.~ Pan agglomeration
293 S  DF  .~ Sulfur
293 A  DF  .~ Flaking, spraying