(under the class definition) Processes which are peculiar to coating a base so that the resulting product is foraminous or porous.
(1) Note. To be included herein the resulting product must be porous or foraminous. Applying a porous coating to a nonporous base is not included herein but classified according to the coating process.
(2) Note. To be included herein a specific technique for keeping the pores or openings from being filled must be included. Thus coating substrates with large openings which are not easily filled are classified elsewhere on some other basis. Coating of cloth, sponges, and filters, etc., are generally here since specific techniques are usually required to keep the substrate porous.
SEE OR SEARCH CLASS
205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,
150, for electrolytic coating of perforated, foraminous, or permeable substrates.
428, Stock Material or Miscellaneous Articles, 566, for a consolidated metal powder product having an interconnected void structure, subclasses 596+ for apertured metallic stock, and subclass 613 for porous metallic stock.
