US PATENT SUBCLASS 524 / 91
.~.~.~.~.~.~.~ Three or more nitrogen atoms in the fused or bridged ring system

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
80  DF  .~.~.~ DNRM which is other than silicon dioxide, glass, titanium dioxide, water, halohydrocarbon, hydrocarbon, or elemental carbon {4}
81  DF  .~.~.~.~ Organic DNRM {21}
86  DF  .~.~.~.~.~ Nitrogen atom as part of a hetero ring DNRM {5}
87  DF  .~.~.~.~.~.~ Nitrogen ring directly fused or bridged to a ring system {5}
91.~.~.~.~.~.~.~ Three or more nitrogen atoms in the fused or bridged ring system

DEFINITION

Classification: 524/91

Three or more nitrogen atoms in the fused or bridged ring system:

(under subclass 87) Subject matter wherein the fused or bridged hetero nitrogen ring containing ring system contains three or more nitrogen atoms.

(1) Note. The nitrogen atoms may be in the same ring or different rings.

SEE OR SEARCH THIS CLASS, SUBCLASS:

92+, for a compound containing two or more fused- or bridged-ring nitrogen containing systems wherein each of the

fused or bridged ring systems contains no more than two hetero nitrogens.