US PATENT SUBCLASS 528 / 344-- .~.~.~.~ Bridged- or fused-ring-containing reactant other than as anhydride fused to a nonfused- or bridged-ring system

US PATENT SUBCLASS 528 / 344
.~.~.~.~ Bridged- or fused-ring-containing reactant other than as anhydride fused to a nonfused- or bridged-ring system

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}
335	DF	.~.~.~ From dicarboxylic acid or derivative thereof and an organic amine, or from an organic amine salt of a dicarboxylic acid {13}
344		.~.~.~.~ Bridged- or fused-ring-containing reactant other than as anhydride fused to a nonfused- or bridged-ring system

DEFINITION

Classification: 528/344

(under subclass 335) Subject matter wherein at least one reactant contains a bridged or fused ring structure.

(1) Note. A bridged or fused ring system for purposes of this subclass requires that a given ring system be attached

at two different nuclear atoms of its ring system to an atom or chain of atoms which, taken together with the two nuclear atoms, forms an additional ring.

(2) Note. Excluded from this subclass as being a fused or bridged ring system is an anhydride group fused or bridged to a ring, which ring by itself is not part of a fused or bridged ring system.