US PATENT SUBCLASS 430 / 78
.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclo systems

Current as of: June, 1999
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430 /   HD   RADIATION IMAGERY CHEMISTRY: PROCESS, COMPOSITION, OR PRODUCT THEREOF

31  DF  ELECTRIC OR MAGNETIC IMAGERY, E.G., XEROGRAPHY, ELECTROGRAPHY, MAGNETOGRAPHY, ETC., PROCESS, COMPOSITION, OR PRODUCT {18}
56  DF  .~ Radiation-sensitive composition or product {10}
75  DF  .~.~ Radiation-conductive composition contains hetero ring {1}
76  DF  .~.~.~ The hetero ring has at least nitrogen as a ring hetero atom {2}
78.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclo systems {1}
79  DF  .~.~.~.~.~> Carbazole {2}

DEFINITION

Classification: 430/78

Polycyclo ring system having the hetero ring as one of the cyclo systems:

(under subclass 76) Compositions wherein the N-hetero atom containing compound, etc., are polycyclic with at least two rings having two atoms in common, e.g., [figure]