| 429 / | HD | CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS |
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| 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} |
| 142 | DF | .~.~ Having plural distinct components {2} |
| 144 |  | .~.~.~ Plural layers {1} |
| 145 | DF | .~.~.~.~> Having defined porosity either functional or by size (i.e., semipermeable, permselective, ionpermeable, microporous, etc.) |