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Selective anodization of capacitor anode body

  • US 5,643,432 A
  • Filed: 07/13/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 07/13/1995
  • Status: Expired due to Term
First Claim
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1. A method for forming dielectric coatings of disparate thickness on the porous anode body of a solid state capacitor comprising the steps of:

  • anodizing said anode body to form a first dielectric coating having a generally uniform thickness through said anode body;

    impregnating said anode body having said first coating with a liquid material forming a barrier to anodization;

    causing increments of said liquid material to be removed from selected areas of said first coating, thereafter subjecting said impregnated anode body to a second anodizing step thereby to form a second dielectric coating on said selected areas while the portions of said first coating in contact with said liquid material are maintained free from said second coating and thereafter driving off the remainder of said liquid.

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