(under subclass 640) Process in which material removal is continued until a passage is made to penetrate completely through the entire workpiece or a distinct layer thereof (i.e., having a discernable boundary).
SEE OR SEARCH THIS CLASS, SUBCLASS:
641+, for electrolytic erosion in which the creation of an aperture is part of sensing a condition used to control the process.
645, for electrolytic erosion in which the creation of an aperture is part of a test or measurement of a condition.
666+, for electrolytic erosion in which a complex pattern is etched using a mask.
717+, for a process in which an entire layer of elemental material is removed from a metallic substrate by electrolytic erosion, the material removed not being limited to a portion of the workpiece surface.
