US PATENT SUBCLASS 521 / 181
.~.~.~ With reactant which is an aldehyde or aldehyde derivative

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}
180  DF  .~.~ Cellular product derived from a phenol, phenol ether, or inorganic phenolate reactant {1}
181.~.~.~ With reactant which is an aldehyde or aldehyde derivative

DEFINITION

Classification: 521/181

With reactant which is an aldehyde or aldehyde derivative:

(under subclass 180) Subject matter wherein the phenol, phenol ether, or inorganic phenolate is reacted with a aldehyde or derivative.

(1) Note. See Class 520, Glossary for a definition of the term "aldehyde". An "aldehyde derivative" is as follows:

(1)

A compound having a -X-CH2-OH group wherein X is other than carbon or hydrogen (e.g. para-formaldehyde, methylol derivatives of urea, etc.).

(2)

A heterocyclic compound having only carbon and oxygen as ring members in an alternating manner and in equal amount, i.e., e.g., trioxane.

(3)

Hexamethylenetetramine (CH2)6N4, known also as methenamine, hexamine, formine, [figure] amino form, hexamethyleneamine and urotropin, and its derivatives.

A derivative for purposes of this subclass requires the basic ring structure of hexamethylenetetramine but wherein the hydrogen atoms may have been replaced by other atoms.

(2) Note. Compounds having a -CH2OH

group bonded to atoms other than C, H or oxygen are regarded as being two compounds; for instance, a methylol derivative of melamine is regarded as a mixture of melamine and formaldehyde and methylol urea is regarded as being a mixture of urea and formaldehyde.

(3) Note. A unspecified novolak or resole is proper for this area in that it is a mixture of a phenol and an aldehyde. If a novolak or resole of specified structure is claimed as a reactant, then classification is proper based on the structure of the specific reactant.