US Patent Class 23-- CHEMISTRY: PHYSICAL PROCESSES

US Patent Class 23
CHEMISTRY: PHYSICAL PROCESSES

	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