US PATENT SUBCLASS 528 / 353-- .~.~.~.~ Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groups

US PATENT SUBCLASS 528 / 353
.~.~.~.~ Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groups

Current as of: June, 1999
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528 /	HD	SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*	DD	SYNTHETIC RESINS (Class 520, Subclass 1) {23}
271	DF	.~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
332	DF	.~.~ With organic amine, or from organic amine salt of a carboxylic acid {2}
350	DF	.~.~.~ From carboxylic acid having three or more carboxylic acid groups or derivatives thereof, and an organic amine, or from an organic amine salt of a tri-or higher carboxylic acid {3}
353		.~.~.~.~ Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groups

DEFINITION

Classification: 528/353

(under subclass 350) Subject matter wherein at least one reactant is a tetra or higher carboxylic acid or is an acid

derivative thereof.

(1) Note. An anhydride having the general formula, which may be linear or cyclic is considered as being a polycarboxylic acid. A compound having both an anhydride and a free carboxylic acid is considered as being a tricarboxylic acid, e.g., as shown in the first illustration, below, and a compound containing two anhydride groups is considered as being a tetracarboxylic acid, e.g., as shown in the second illustration, below. [figure] [figure]