(under subclass 592) Process for making multiple perforations in a metallic sheet, tube, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6.1+, for a process or apparatus for making apertures in sheet material and thereafter deforming the apertured portion of the sheet to form an expanded metal article.
SEE OR SEARCH CLASS
83, Cutting,
13+, for a process of cutting, generally.
205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, 75, for an electrolytic method of making a perforated article.
428, Stock Material or Miscellaneous Articles,
592, for metallic stock material which is helical or has a helical component and subclass 596 for such material which has apertures or cuts.
