Patent ID: 8268019

Claim:
A method of making a capacitor element having opposed indentations in its laterally opposite sides defining ribs, oppositely disposed channels and at least one web between said oppositely disposed channels comprising the steps of: providing a compression chamber; placing a predetermined amount of valve powder in said compression chamber; compacting said powder with interleaved sets of opposed rib and channel punches to form said ribs and channels by moving said punches from non-compacting positions to compacting position producing the same degree of compaction in said ribs as in said web between said channels; and withdrawing said punches in which said channel punches are withdrawn from said capacitor element prior to withdrawal of said rib punches wherein said rib punches have a first distance in a non-compacting position, a second distance in a compacting position and a first ratio which is said first distance divided by said second distance and said channel punches have a third distance in a non-compacting position, a fourth distance in a compacting position and a second ratio which is said third distance divided by said fourth distance wherein said first ratio and said second ratio are the same.