US PATENT SUBCLASS 528 / 201
.~.~.~ Fused- or bridged-ring-containing reactant other than solely as a polycarboxylic acid anhydride group

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}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
196  DF  .~.~ With reactant having halo-C(=O)-halo, halo-C(=O)-O-, or -O-C(=O)-O- group {5}
201.~.~.~ Fused- or bridged-ring-containing reactant other than solely as a polycarboxylic acid anhydride group

DEFINITION

Classification: 528/201

(under subclass 196) Subject matter wherein at least one reactant contains a fused or bridged ring with the proviso that a cyclic anhydride group is not the sole group fused or bridged to another ring.

(1) Note. A bridged or fused ring system of this subclass requires that a given ring system be attached at two different nuclear atoms of its ring to an atom or group of atoms which, when taken together with the two nuclear atoms, forms an additional ring system.