McDermott, Will & Emery
Method of manufacturing aluminum foil for aluminum electrolytic capacitor
 An inventive method of preparing an aluminum foil used in a high voltage aluminum electrolytic capacitor is disclosed. The method involves: PA1 (a) immersing an aluminum foil in a first forming solution, PA1 (b) applying a first voltage to said aluminum foil immersed in said first forming solution, PA1 (c) immersing said aluminum foil to which said first voltage is applied in a second forming solution, without passing current, and PA1 (d) applying a second voltage to said aluminum foil immersed in said second forming solution. Also disclosed is an aluminum foil that renders an electrolytic capacitor having properties of both high electrostatic capacity and small leak current. 
Matsushita Electric Industrial Co., Ltd.
C C
C25D C25D
inventional inventional
Kenji Takahiro Koichi Mitsuhisa
Yoshida Suzuki Kojima Yoshimura