US PATENT SUBCLASS 528 / 74
.~.~ Reactant contains at least one bridged- or fused-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}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
74.~.~ Reactant contains at least one bridged- or fused-ring system


DEFINITION

Classification: 528/74

(under subclass 44) Subject matter wherein at least one reactant contains a fused or bridged ring system.

(1) Note. A bridged or fused ring system for purposes of this subclass requires that a ring system be attached at two different atoms of its nuclear skeleton to an atom or chain of atoms which when taken together with the nuclear atoms forms an additional ring structure.