US PATENT SUBCLASS 521 / 90
.~.~.~ Ingredient is a heterocyclic compound

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
82  DF  .~.~ Process of forming a cellular product subsequent to solid polymer formation in the presence of a stated ingredient, noncellular composition capable of forming a cellular product and containing a stated ingredient, or process of preparing same {14}
90.~.~.~ Ingredient is a heterocyclic compound

DEFINITION

Classification: 521/90

Ingredient is a heterocyclic compound:

(under subclass 82) Subject matter wherein the stated ingredient contains a heterocyclic ring.

(1) Note. See the Glossary in this class (521) for a definition of the term "heterocyclic".

SEE OR SEARCH THIS CLASS, SUBCLASS:

88, for an epoxy compound, morpholine, or cyclic anhydride,

utilized as a stated ingredient.

89, for a heterocyclic compound having a sulfur atom as a ring atom utilized as a stated ingredient.