US PATENT SUBCLASS 428 / 474.4
.~ Of polyamide

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

411.1  DF  COMPOSITE (NONSTRUCTURAL LAMINATE) {25}
474.4.~ Of polyamide {8}
474.7  DF  .~.~> Next to second layer of polyamide {1}
475.2  DF  .~.~> Next to polyester
475.5  DF  .~.~> Nylon type {1}
476.3  DF  .~.~> Next to addition polymer from unsaturated monomer(s) {2}
477.4  DF  .~.~> Next to aldehyde or ketone condensation product
477.7  DF  .~.~> Inorganic-containing or next to inorganic-containing
478.2  DF  .~.~> Natural source-type polyamide (e.g., casein, gelatin, etc.) {1}
479.3  DF  .~.~> Next to cellulosic {1}

DEFINITION

Classification: 428/474.4

Of polyamide:

(under subclass 411.1) Product in which a layer contains a polymeric compound, comprising recurring amide groups, as illustrated below, through which the monomer residues are linearly linked, except urea-aldehyde [figure]

(1) Note. A patent claiming a laminate comprising a layer of the reaction product of a polyamine and a polybasic acid (e.g., nylon), or other condensation polymer of an amino acid such as caprolactam, will be placed in this or an indented subclass.

(2) Note. Urea-aldehyde condensation products are significantly different from other polyamide resins and are similar in spatial structure to phenol-aldehydes. Hence, patents claiming a laminate of only urea-aldehyde are collected with aldehyde or ketone condensation* products in subclasses 477.4 and 524+ and see the subclasses referred to in the notes to subclass 524.

SEE OR SEARCH THIS CLASS, SUBCLASS:

395, for a coated fiber, filament, rod or strand made of polyamide.

435, and 458, for a laminate of polyamide next to quartz or glass or metal, respectively.

473.5, for a laminate having both polyamide and polyimide, in the same or different layers. SEE OR SEARCH CLASS

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

168, for a coated or impregnated synthetic polyamide fiber fabric and subclass 291 for a fabric with a preformed polyamide sheet or film.