The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2003
Filed:
Mar. 19, 2001
Christopher Feger, Easley, SC (US);
Pacesetter, Inc., Sunnyvale, CA (US);
Abstract
The present invention is directed to a high voltage, highly conductive electrolyte for use in electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and N-methylformamide; a combination of hypophosphorous acid, boric acid and an aliphatic dicarboxylic acid of carbon chain length from eight to twelve, such as azelaic, sebacic, or brassylic acid; an amine including ammonia, ammonium hydroxide, diethylamine, dimethylamine, triethylamine, or triethanolamine; and a nitro-substituted aromatic compound as a degassing agent, such as 3′-nitroacetophenone. Anhydrous ammonia may also be added to neutralize the solution. In an alternative embodiment of the electrolyte of the present invention, the ethylene glycol/NMF two solvent mixture can be substituted with 1,2-propanediol, using &ggr;-butyrolactone as a cosolvent with or without NMF. The electrolyte of the present invention will allow the construction of multi-anode capacitors with low equivalent series resistance (ESR), which will have superior energy density and delivery, while being thinner due to fewer spacer and cathode layers with the same number of anodes. This resultant capacitor, when incorporated into an ICD, will reduce the size and thickness of the overall device.