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:
Mar. 16, 2004
Filed:
Apr. 21, 2003
David A. Evans, Seekonk, MA (US);
Ross Blakeney, Kentville, Nova Scotia, CA;
Other;
Abstract
A flat capacitor and a method of making the flat capacitor, the capacitor having a one-piece metal foil case. The capacitor includes a metal foil case with a flange, the case being made of a blank that is folded onto itself so the peripheral flanges are brought into mutual contact and welded. A lead extends from an anode within the capacitor through a hole in the capacitor case in the fold. An elastomeric body inserted in the hole and surrounding the lead provides electrical insulation and a seal is produced when the metal foil blank is folded to close the case of the capacitor. Preferably, the anode is a wet slug anode, such as sintered tantalum having an oxide coating, and the inside surface of the metal foil case is preferably coated with a porous metal oxide, such as ruthenium oxide, providing a capacitor with high energy storage density and breakdown voltage.