Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Reexamination Certificate
2002-11-01
2004-05-04
Reichard, Dean A. (Department: 2831)
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
C361S311000, C361S313000, C361S321100, C361S306100
Reexamination Certificate
active
06731495
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to stacks of thin films used as capacitors.
It is well known in electronic circuits to use capacitors. Printed circuit boards (PCBs) have a limitation of using roll form or powder/electrolytic capacitors suspended over or under the board. It would be desirable to have a flat capacitor that can be attached directly to the board, or be integrated in the board with adequate electrical parameters and stability. As such, it is an object of the invention to provide such a capacitor.
It has been discovered that this object can be met by a capacitor that includes alternating layers of tantalum pentoxide or niobium pentoxide and an electrically conductive polymer film such as H.C. Starck, Inc.'s Baytron® line of polythiophene-based polymers. Advantageously, many types of thin conductive polymer films can be used.
SUMMARY OF THE INVENTION
The invention relates to a thin film capacitor that includes (a) a substrate, (b) a first polymeric film comprising an electrically conductive polymer located on the substrate, (c) a pentoxide layer selected from the group consisting of tantalum pentoxide, or niobium pentoxide, and mixtures thereof, located on a surface of the first polymeric film, (d) a second polymeric film comprising a conductive polymer located on a surface of the pentoxide layer.
REFERENCES:
patent: 3819990 (1974-06-01), Hayashi et al.
patent: 5126921 (1992-06-01), Fujishima et al.
patent: 5978207 (1999-11-01), Anderson et al.
patent: 1005260 (2000-05-01), None
patent: 05047588 (1993-02-01), None
patent: 05114532 (1993-05-01), None
patent: 09283389 (1997-10-01), None
Kumar Prabhat
Uhlenhut Henning
Akorli Godfried R.
Eyl Diderico van
H. C. Starck Inc.
Ha Nguyen T.
Reichard Dean A.
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