US PATENT SUBCLASS 524 / 87
.~.~.~.~.~.~ Nitrogen ring directly fused or bridged to a 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.~.~.~.~.~.~ Nitrogen ring directly fused or bridged to a ring system {5}
88  DF  .~.~.~.~.~.~.~> Tetrabenzoporphyrazine nucleus containing, e.g., phthalocyanine, etc.
89  DF  .~.~.~.~.~.~.~> Nitrogen ring is part of a ring system having three or more rings fused or bridged together {1}
91  DF  .~.~.~.~.~.~.~> Three or more nitrogen atoms in the fused or bridged ring system
92  DF  .~.~.~.~.~.~.~> Two nitrogen atoms in the fused or bridged ring system {1}
94  DF  .~.~.~.~.~.~.~> Five-membered nitrogen containing ring

DEFINITION

Classification: 524/87

Nitrogen ring directly fused or bridged to a ring system:

(under subclass 86) Subject matter wherein the hetero nitrogen ring is directly fused or bridged to a ring system.

(1) Note. A ring system herein may contain more than one ring.

(2) Note. See the Class 520 Glossary for a definition of the term "fused or bridged ring system".