US PATENT SUBCLASS 71 / 38-- .~.~.~.~.~ Gaseous

US PATENT SUBCLASS 71 / 38
.~.~.~.~.~ Gaseous

Current as of: June, 1999
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71 /	HD	CHEMISTRY: FERTILIZERS

1	DF	PROCESSES AND PRODUCTS {5}
31	DF	.~ Inorganic material {5}
32	DF	.~.~ Phosphorus-containing {1}
33	DF	.~.~.~ Phosphates {6}
37	DF	.~.~.~.~ Acid treatment {4}
38		.~.~.~.~.~ Gaseous

DEFINITION

Classification: 71/38

(under subclass 37) Processes wherein the acid is supplied in the gaseous state.