US PATENT SUBCLASS 528 / 54
.~.~.~.~.~ Nitrogen compound wherein nitrogen atom is bonded to three atoms of carbon contains a bridged- or fused-ring system, e.g., triethylene diamine, etc.

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}
48  DF  .~.~ Process of polymerizing in the presence of a specified material other than reactant {5}
52  DF  .~.~.~ Material is organic nitrogen-containing compoud {1}
53  DF  .~.~.~.~ Organic nitrogen compound contains a nitrogen atom bonded to three atoms or carbon {1}
54.~.~.~.~.~ Nitrogen compound wherein nitrogen atom is bonded to three atoms of carbon contains a bridged- or fused-ring system, e.g., triethylene diamine, etc.

DEFINITION

Classification: 528/54

(under subclass 53) Subject matter wherein the nitrogen compound whose nitrogen atom is bonded to three atoms of carbon, contains a fused- or bridged-ring system (e.g., triethylene diamine, etc.).

(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.