US PATENT SUBCLASS 429 / 141
.~.~.~.~ Having plural layers of diverse material

Current as of: June, 1999
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429 /   HD   CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS

122  DF  CURRENT PRODUCING CELL, ELEMENTS, SUBCOMBINATIONS AND COMPOSITIONS FOR USE THEREWITH AND ADJUNCTS {16}
129  DF  .~ Separator, retainer or spacer insulating structure (other than a single porous flat sheet, or either an impregnated or coated sheet not having distinct layers) {4}
131  DF  .~.~ Having electrode enclosing feature {4}
140  DF  .~.~.~ Tubular type {1}
141.~.~.~.~ Having plural layers of diverse material

DEFINITION

Classification: 429/141

(under subclass 140) Apparatus wherein the tubular structure is composed of multiple laminae, at least two of which are from different materials.