Chemistry: physical processes > Patents

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Class Information
Number: 23
Name: Chemistry: physical processes >
Description: Processes for preparation or treatment of inorganic compounds and nonmetallic elements which involve only physical treatments not specifically provided for in some other class. See subclass 293.

Class Number	Class Name	No. of Patents
23/293R	Physical processes	132
23/313R	Agglomerating	253
23/314	Carbon	54
23/313FB	Fluidized bed	108
23/313P	Pan agglomeration	45
23/313AS	Silicate	70
23/306	Concentration of liquids in liquids	20
23/307	With direct heating	10
23/295R	Crystallization	203
23/302R	Alkali metal and ammonium compounds	101
23/302A	Ammonium compounds	19
23/303	Common salt	56
23/302T	Sodium compounds	163
23/304	Alkaline earth metal and magnesium compounds	65
23/295G	Gel	14
23/305R	Heavy metal or aluminum compounds	30
23/305A	Aluminum compounds	87
23/305F	Iron compounds	13
23/305RE	Rare earth compounds	14
23/296	Selective	78
23/298	From natural sources	35
23/297	With extraction	25
23/295S	Solar	19
23/300	With added material	116
23/301	Seed	146
23/299	With extraction	30
23/293A	Flaking, spraying	37
23/308R	Melting out	15
23/308S	Sulfur	12
23/294R	Sublimation	47
23/294S	Sulfur	9
23/293S	Sulfur	45