US PATENT SUBCLASS 524 / 347
.~.~.~.~.~.~.~ 1,4-dihydroxy, e.g., hydroquinone, etc.

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}
323  DF  .~.~.~.~.~ Aryl-OH or salt or aryl-O-metal bond DNRM {12}
345  DF  .~.~.~.~.~.~ Polyhydric aryl-OH compound {2}
347.~.~.~.~.~.~.~ 1,4-dihydroxy, e.g., hydroquinone, etc.

DEFINITION

Classification: 524/347

1,4-dihydroxy, e.g., hydroquinone, etc.:

(under subclass 345) Subject matter wherein the designated nonreactant material contains only two hydroxyl and wherein the hydroxyl groups are directly attached to the 1,4 position of the same aryl group, e.g., hydroquinone, etc.