Patents Assigned to KDK Corporation
  • Aluminum electrode foil for electrolytic capacitor and electrolytic capacitor using the foil
    Patent number: 6038124
    Abstract: An aluminum electrode foil for an electrolytic capacitor has a sponge-like etching layer formed on at least one of the surfaces thereof, and the sponge-like etching layer is reduced in a direction of thickness. The aluminum density of the reduced sponge-like etching layer `d2` is set from 0.8 to 2.2 g/cm.sup.3.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: March 14, 2000
    Assignees: KDK Corporation, Showa Aluminum Corporation
    Inventors: Hidenori Uchi, Masakazu Furukawa, Tadao Fujihira, Ichizo Tsukuda, Eizo Isoyama
  • Method of etching aluminum foil
    Patent number: 5405493
    Abstract: A method of etching increases the surface area of a metal foil by creating uniformly distributed etch tunnels. The foil is pretreated by depositing a discontinuous surface layer of metal that is cathodic to the foil, followed by chemically etching the foil to remove a portion of the deposited metal. Finally, the foil is electrochemically etched to create the etch tunnels.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: April 11, 1995
    Assignee: KDK Corporation
    Inventor: David Goad