US PATENT SUBCLASS 204 / 515-- .~.~ Inorganic siliceous or calcareous material prepared, separated, or treated (e.g., clay, earth, concrete, asbestos, glass, etc.)

US PATENT SUBCLASS 204 / 515
.~.~ Inorganic siliceous or calcareous material prepared, separated, or treated (e.g., clay, earth, concrete, asbestos, glass, etc.)

Current as of: June, 1999
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204 /	HD	CHEMISTRY: ELECTRICAL AND WAVE ENERGY

*	DD	PROCESSES AND PRODUCTS {7}
450	DF	.~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14}
515		.~.~ Inorganic siliceous or calcareous material prepared, separated, or treated (e.g., clay, earth, concrete, asbestos, glass, etc.) {1}
516	DF	.~.~.~> Barrier separation (e.g., using membrane, filter paper, etc.) {1}

DEFINITION

Classification: 204/515

Inorganic siliceous or calcareous material prepared, separated, or treated (e.g., clay, earth, concrete, asbestos, glass, etc.):

(under subclass 450) Process involving preparation, separation, or treatment of a material containing silica or calcium (e.g., clay, earth, concrete, asbestos, glass, etc.).

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids, appropriate subclasses for drying and gas or vapor contacting of solids, in general, especially

1, for processes and apparatus involving the subjection of solids to electrical energy; but not involving electrolysis, electrophoresis, or electro-osmosis.