US PATENT SUBCLASS 528 / 190
.~.~.~ Reactant contains a fused- or bridged-ring other than solely as a polycarboxylic acid anhydride group

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
176  DF  .~.~ With polycarboxylic acid or derivative as reactant {8}
190.~.~.~ Reactant contains a fused- or bridged-ring other than solely as a polycarboxylic acid anhydride group

DEFINITION

Classification: 528/190

(under subclass 176) Subject matter wherein at least one reactant contains a fused or bridged ring structure with the proviso that a cyclic anhydride is not the only ring fused or bridged to another ring.

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

176, for the reaction of a phenolic reactant with a reactant containing a carboxylic anhydride group.