Capacitor containing aluminum anode foil anodized in low...

Details Capacitor containing aluminum anode foil anodized in low... Capacitor containing aluminum anode foil anodized in low...

2006-10-24

2006-10-24

McNeil, Jennifer C. (Department: 1775)

Stock material or miscellaneous articles

Composite

Of metal

C428S469000, C428S472300, C428S935000, C205S318000, C205S332000, C205S324000, C361S524000

Reexamination Certificate

active

07125610

ABSTRACT:
A capacitor comprising an aluminum anode and a dielectric layer comprising phosphate doped aluminum oxide and process for making the capacitor. The capacitor has a CV Product of at least 9 μF-V/cm2at 250 volts. Furthermore, the capacitor is formed by the process of: forming an aluminum plate; contacting the plate with an anodizing solution comprising glycerine, 0.1 to 1.0%, by weight, water and 0.01 to 0.5%, by weight, orthophosphate; applying a voltage to the aluminum plate and determining an initial current; maintaining the first voltage until a first measured current is no more than 50% of the initial current; increasing the voltage and redetermining the initial current; maintaining the increased voltage until a second measured current is no more than 50% of the redetermined initial current, and continuing the increasing of the voltage and maintaining the increased voltage until a final voltage is achieved.

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