US PATENT SUBCLASS 428 / 492
.~ Of natural rubber

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

411.1  DF  COMPOSITE (NONSTRUCTURAL LAMINATE) {25}
492.~ Of natural rubber {3}
493  DF  .~.~> Next to second layer of natural rubber
494  DF  .~.~> Next to aldehyde or ketone condensation product or addition polymer from unsaturated monomers {1}
496  DF  .~.~> Next to cellulosic

DEFINITION

Classification: 428/492

(under subclass 411.1) Product in which at least one layer contains natural rubber*.

(1) Note. The rubber may be modified by chemical treatment and/or admixed with other natural or with synthetic, resin(s).

(2) Note. A patent claiming a laminate comprising a layer of rubber, without indication of a synthetic origin, will be placed here.

(3) Note. Synthetic rubber is usually derived from addition polymers of polyene monomers and, unless the synthetic rubber is disclosed as a polysulfide rubber, laminates containing such a layer will be classified with addition polymers. "Thio" or polysulfide rubber is considered polythioether.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310+, for a composite* web* or sheet* in which one component* is porous or cellular and is made of foamed or expanded material, which may be natural rubber and subclass 316, for a similar composite* web* or sheet* in which the porous component* may be natural rubber.

356, for a composite* web* or sheet* having an outer layer of adhesive material and in which natural rubber is part of the adhesive composition. 382, and 390, for a rod*, strand*, fiber* or filament* in which natural rubber is a coating, either as one of plural coatings or as a single coating.

419, for a laminate which contains a polysulfide synthetic rubber and see (3) Note above.

440, and 465, for a natural rubber layer next to quartz or glass or metal, respectively.

500+, for a laminate which contains synthetic rubber (other than polysulfide) and see (3) Note above.

SEE OR SEARCH CLASS

442, Fabric (Woven, Knitted, or Nonwoven Textile or Cloth, etc.),

84, 90, 100, and 159 for a coated or impregnated fabric that contains natural oil, gum, or rosin.