US PATENT SUBCLASS 442 / 270
.~.~ Needled

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

181  DF  WOVEN FABRIC (I.E., WOVEN STRAND OR STRIP MATERIAL) {13}
268  DF  .~ Woven fabric including a nonwoven fabric layer other than paper {4}
270.~.~ Needled {3}
271  DF  .~.~.~> Including an additional nonwoven fabric {2}
274  DF  .~.~.~> Nonwoven fabric layer comprises at least two chemically different fibers
275  DF  .~.~.~> Coated, impregnated, or autogenously bonded

DEFINITION

Classification: 442/270

Needled:

(under subclass 268) Subject matter wherein the fabric layers have been adhered to one another by a mechanical needling.

(1) Note. In a mechanical needling process, barbed needles are forced through fibrous layers and in the process displace enough fibers to cause interlayer penetration of fibers and fiber layer bonding as a consequence of interlayer fiber friction.