High power capacitors from thin layers of metal powder or...

Details High power capacitors from thin layers of metal powder or... High power capacitors from thin layers of metal powder or...

2005-07-05

2005-07-05

Reichard, Dean A. (Department: 2831)

Electricity: electrical systems and devices

Electrolytic systems or devices

Liquid electrolytic capacitor

C361S509000, C361S512000, C361S516000, C361S525000, C361S530000

Reexamination Certificate

active

06914769

ABSTRACT:
An anode (14, 208, 410) and/or cathode (12, 212, 420) of a capacitor has a large surface area. The high surface area of the anode is provided by forming the anode from a thin, electrically conductive layer (16) formed from metal particles (18) or an electrically conductive metallic sponge (416). These materials provide a porous structure with a large surface area of high accessibility. The particles are preferably directional or non-directional sponge particles of a metal, such as titanium. The conductive layer has a dielectric film (36, 236, 414) on its surface, formed by anodizing the particle surfaces. The dielectric film has a combination of high dielectric constant and high dielectric strength. The cathode (12, 212, 420) of the capacitor is either a conventional solid material or, more preferably, has a large surface provided by forming the surface from a sponge or particles analogously to the anode. The high dielectric strengths obtainable from the capacitor allow for extreme miniaturization, making the capacitor particularly suited for integrated circuit applications.

REFERENCES:
patent: 4164005 (1979-08-01), Cheseldine
patent: 4623910 (1986-11-01), Risberg
patent: 5254137 (1993-10-01), Mitani
patent: 5592009 (1997-01-01), Hidaka
patent: 5729428 (1998-03-01), Sakata et al.
patent: 6144057 (2000-11-01), Yamazaki
patent: 6226173 (2001-05-01), Welsch et al.

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