US PATENT SUBCLASS 524 / 255
.~.~.~.~.~.~.~.~.~.~ Two or more separate aryl ring systems

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}
186  DF  .~.~.~.~.~ Organo nitrogen compound other than unsubstituted ammonium salt as sole nitrogen atom DNRM {12}
236  DF  .~.~.~.~.~.~ Trivalent or tetravalent nitrogen atom other than unsubstituted ammonium {6}
251  DF  .~.~.~.~.~.~.~ N, C, and H atoms only {2}
252  DF  .~.~.~.~.~.~.~.~ Two or more nitrogen atoms {2}
254  DF  .~.~.~.~.~.~.~.~.~ Aryl {1}
255.~.~.~.~.~.~.~.~.~.~ Two or more separate aryl ring systems {1}
256  DF  .~.~.~.~.~.~.~>.~.~.~.~ At least one aryl ring which is part of a fused or bridged ring system

DEFINITION

Classification: 524/255

Two or more separate aryl ring systems:

(under subclass 254) Subject matter wherein the plural nitrogen compound contains at least two separate aryl ring systems.

(1) Note. To be proper for this subclass, there must be at

least two separate ring systems, each of which contains an aryl group. A naphthalene or polyaromatic ring system is not to be considered as having separate aryl ring systems.