US PATENT SUBCLASS 428 / 515
.~.~ Next to second addition polymer from unsaturated monomers

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

411.1  DF  COMPOSITE (NONSTRUCTURAL LAMINATE) {25}
500  DF  .~ Of addition polymer from unsaturated monomers {6}
515.~.~ Next to second addition polymer from unsaturated monomers {3}
516  DF  .~.~.~> Monoolefin polymer {2}
519  DF  .~.~.~> Including polyene monomers
520  DF  .~.~.~> Ester, halide or nitrile of addition polymer

DEFINITION

Classification: 428/515

(under subclass 500) Product comprising a plurality of contiguous layers, each of which is an addition polymer from unsaturated monomers, with the respective layers disclosed as differing in some respect.

(1) Note. The "differing" may be in degree of polymerization, kind or amount of additive, vulcanization, or physical property.

(2) Note. Two identical layers which are fused together so as to eliminate the interface are considered as constituting a single layer and, in the absence of any claimed structure a patent claiming such a layer will be placed in the appropriate composition class.

(3) Note. Two identical layers of addition polymer which cohere through molecular attraction or other bonding force, e.g., static electricity, are not considered to differ. Thus, patents claiming such layers will be placed in subclass 500.

SEE OR SEARCH THIS CLASS, SUBCLASS:

212+, for layers or components having the same physical characteristics in differing degree.

500, for plural layers of addition polymer, identical in composition and physical properties, which are directly cohered to each other; and see (3) Note above.