US PATENT SUBCLASS 96 / 11-- .~ Plural layers (e.g., laminated barrier, etc.)

US PATENT SUBCLASS 96 / 11
.~ Plural layers (e.g., laminated barrier, etc.)

Current as of: June, 1999
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96 /	HD	GAS SEPARATION: APPARATUS

4	DD	APPARATUS FOR SELECTIVE DIFFUSION OF GASES (E.G., SEMIPERMEABLE MEMBRANE, ETC.) {6}
11		.~ Plural layers (e.g., laminated barrier, etc.) {1}
12	DF	.~.~> Organic compound containing layer {1}

DEFINITION

Classification: 96/11

Plural layers (e.g., laminated barrier, etc.):

(under subclass 4) Apparatus in which the barrier for gas diffusion comprises two or more distinguishable layers.

(1) Note. The layers or laminates may be of similar composition. Where the barrier has been formed by evaporation of one or more components to result in a surface layer depleted in these components and the surface layer is distinguishable from the remaining barrier thickness upon subsequent inspection, the barrier is taken to be composed of at least two distinguishable layers.

(2) Note. Plural layer (or laminated) membranes are often referred to as composites. However, the use of this term as applied to classification in this subclass does not include a single porous barrier material impregnated with a second material unless enough of the second material remains on the exterior of the single porous barrier material to form a distinguishable coating or second layer.