US PATENT SUBCLASS 429 / 145
.~.~.~.~ Having defined porosity either functional or by size (i.e., semipermeable, permselective, ionpermeable, microporous, etc.)

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}
142  DF  .~.~ Having plural distinct components {2}
144  DF  .~.~.~ Plural layers {1}
145.~.~.~.~ Having defined porosity either functional or by size (i.e., semipermeable, permselective, ionpermeable, microporous, etc.)

DEFINITION

Classification: 429/145

(under subclass 144) Apparatus wherein the porosity characteristic of at least one layer has been specifically defined.

SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles,

566, for metallic stock material containing metal particles and having an interconnected void structure.