US PATENT SUBCLASS 442 / 138
.~.~ Coating or impregnation is specified as an intumescent material

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}
136  DF  .~ Coating or impregnation provides heat or fire protection {7}
138.~.~ Coating or impregnation is specified as an intumescent material

DEFINITION

Classification: 442/138

Coating or impregnation is specified as an intumescent

material:

(under subclass 136) Subject matter wherein the coating or impregnation is specifically stated to be an intumescent material.

(1) Note. An intumescent material comprises a material which swells, enlarges, or expands upon application of moisture or heat.