US PATENT SUBCLASS 23 / 295 R
.~ Crystallization

Current as of: June, 1999
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23 /   HD   CHEMISTRY: PHYSICAL PROCESSES

293 R  DF  PHYSICAL PROCESSES {7}
295 R.~ Crystallization {8}
296  DF  .~.~> Selective {2}
299  DF  .~.~> With extraction
300  DF  .~.~> With added material {1}
302 R  DF  .~.~> Alkali metal and ammonium compounds {3}
304  DF  .~.~> Alkaline earth metal and magnesium compounds
305 R  DF  .~.~> Heavy metal or aluminum compounds {3}
295 G  DF  .~.~> Gel
295 S  DF  .~.~> Solar

Unofficial Alpha Subclasses: R G S

DEFINITION

Classification: 23/295

(under subclass 293) Processes directed to or including crystallization as a significant step.

SEE OR SEARCH CLASS

29, Metal Working,

25.35, for processes of manufacturing piezo-electric crystal devices which include crystallizing and additional manufacturing operations.

62, Refrigeration, for processes of crystallization including a step of refrigeration, especially see

66+, and subclasses 532+. 65, Glass Manufacturing,

33.1+, for a process of devitrifying of vitrifying glass combined with a glassworking operation.

117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, for processes and non-coating apparatus for growing therein-defined single-crystal of all types of materials, including inorganic or organic.

127, Sugar, Starch, and Carbohydrates,

58+, for the crystallization of sugar.

159, Concentrating Evaporators, for processes for mere evaporation of a solution or suspension of a solid in a liquid whether or not the claims are directed to treatment of a definite chemical compound or element, unless such processes are provided for elsewhere. The combination of evaporation and significant crystallization is in this class (23).

203, Distillation: Processes, Separatory,

48, for a distillation process including the step of crystallizing a material from a distillate or residue.

423, Chemistry of Inorganic Compounds, appropriate subclasses, for chemical processes of manufacturing inorganic compounds and nonmetallic elements which may involve crystallizing.

501, Compositions: Ceramic,

2+, for devitrified glass compositions, and subclass 86 for synthetic precious stone compositions.