U.S. Philips Corporation

North American Philips Corporation

Pacesetter, Inc.

Jesse S Shaffer

Christopher R Feger

Thomas A Kent

An electrolyte including &#x3b3;-butyrolactone, a cosolvent and an alcohol is disclosed, which may be used in an electrolytic capacitor with very high operating voltage. Optional additional additives are added to the electrolyte to enhance its conductivity and reliability.

Electrolyte for high voltage electrolytic capacitors

The invention relates to a method of producing aluminum capacitor foil adapted for use in high voltage AC motor start capacitors. Aluminum foil is electrolytically etched in a hot aqueous solution of sodium cloride and then immersed in a hot solution of nitric acid. The foil is immediately thereafter passivated in a dilute aqueous solution of phosphoric acid. The passivated foil is electrolytically treated at a first voltage of at least 150 but not greater than 250 volts in a solution of an ammonium salt of a phosphate, a silicate or a vanadinate to substantially reduce the leakage current, and further electrolytically treated at a second voltage of a magnitude about twice that of the first voltage in a solution of an ammonium salt of an aliphatic dicarboxylic acid of at least 9 carbon atoms and ammonium phosphate until an essentailly amorphous oxide is formed on the foil.

Method of producing ultra stable aluminum oxide for high volt

A solid electrolytic capacitor includes a conductive polymer electrolyte. The electrolyte may comprise p-doped polyacrylonitrile, polypyrrole, or polyacetylene.

Electrolytic capacitor with polymer conductor

An aluminum electrolytic capacitor having improved axial heat dissipation resulting from a smaller ratio between the width of the anode foil and the diameter of the capacitor foil roll.

Heat dissipation aluminum electrolytic capacitor

Aluminum foil exhibiting a good combination of capacitance and mechanical strength is produced by an etching procedure that includes the steps of AC pre-etching aluminum foil in an acid bath containing hydrochloric acid and then, without removing the hydrochloric acid from the foil, etching the foil with a high density DC while the foil is immersed in an aqueous solution of sodium chloride and sodium sulfate.

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Columbia, SC, United States of America

Jesse S Shaffer