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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

139
23/313R

Agglomerating

275
23/314

Carbon

59
23/313FB

Fluidized bed

117
23/313P

Pan agglomeration

49
23/313AS

Silicate

75
23/306

Concentration of liquids in liquids

24
23/307

With direct heating

10
23/295R

Crystallization

260
23/302R

Alkali metal and ammonium compounds

112
23/302A

Ammonium compounds

25
23/303

Common salt

66
23/302T

Sodium compounds

179
23/304

Alkaline earth metal and magnesium compounds

76
23/295G

Gel

14
23/305R

Heavy metal or aluminum compounds

34
23/305A

Aluminum compounds

92
23/305F

Iron compounds

13
23/305RE

Rare earth compounds

14
23/296

Selective

92
23/298

From natural sources

39
23/297

With extraction

31
23/295S

Solar

22
23/300

With added material

131
23/301

Seed

154
23/299

With extraction

38
23/293A

Flaking, spraying

43
23/308R

Melting out

21
23/308S

Sulfur

16
23/294R

Sublimation

54
23/294S

Sulfur

10
23/293S

Sulfur

50
 
 
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