US PATENT SUBCLASS 442 / 76
.~ Coating or impregnation specified as porous or permeable to a specific substance (e.g., water vapor, air, etc.)

Current as of: June, 1999
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442 /   HD   FABRIC (WOVEN, KNITTED, OR NONWOVEN TEXTILE OR CLOTH, ETC.)

59  DF  COATED OR IMPREGNATED WOVEN, KNIT, OR NONWOVEN FABRIC WHICH IS NOT (A) ASSOCIATED WITH ANOTHER PREFORMED LAYER OR FIBER LAYER OR, (B) WITH RESPECT TO WOVEN AND KNIT, CHARACTERIZED, RESPECTIVELY, BY A PARTICULAR OR DIFFERENTIAL WEAVE OR KNIT, WHEREIN THE COATING OR IMPREGNATION IS NEITHER A FOAMED MATERIAL NOR A FREE METAL OR ALLOY LAYER {36}
76.~ Coating or impregnation specified as porous or permeable to a specific substance (e.g., water vapor, air, etc.) {1}
77  DF  .~.~> Coating or impregnation is specified as microporous but is not a foam

DEFINITION

Classification: 442/76

Coating or impregnation specified as porous or permeable to a specific substance (e.g., water vapor, air, etc.):

(under subclass 59) Subject matter wherein the coating or impregnation is porous or permeable to water vapor, air, or some other specific substance, the porosity or permeability being specifically stated.