(under subclass 546) Subject matter specified as having pores which are interconnected with each other and unfilled.
(1) Note. Mere porosity in the product or a density less than theoretical is not sufficient for placement of a patent in this subclass; however, where the product is defined as "permeable" or a porosity of greater than 40% (density less then 60%) is claimed, it is assumed that the product has an interconnected void structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
539.5, and 567, for similar products in which the interconnected void structure is filled with a nonmetal substance or a different metal, respectively.
547, for a particulate metallic stock-material* in which the porosity varies.
613, for metallic stock-material* partially or wholly porous, which does not contain consolidated metal powder.
SEE OR SEARCH CLASS
51, Abrasive Tool Making Process, Material, or Composition, particularly
296, for a process or tool defined thereby including the step of forming pores of voids in the finished article, or abrading tool compositions including one or more materials which form pores or voids therein.
210, Liquid Purification or Separation,
510.1, for a filter in the form of a porous unitary mass which is peculiar to that class (210).
429, Chemistry: Electrical Current Producing Apparatus, Product and Process,
145, for a battery separator having plural layers of defined porosity.
