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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
 
 
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