Anodes with corner and edge modified designs

Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature

Reexamination Certificate

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C428S220000, C428S304400, C428S319100, C428S319300, C428S209000, C428S689000, C428S698000, C428S702000, C361S528000

Reexamination Certificate

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07658986

ABSTRACT:
Porous sintered anode bodies for capacitors formed from valve metals are treated by electrolysis to form a dielectric layer and coated with cathode layers. When standard parallelpiped shapes are used, cathode coverage at the edges and corners is non-uniform and failures occur at those locations. Rectangular prisms, obround prisms and cylindrical prisms are formed with transition surfaces at edges and corners, such as chamfers and curves, to enhance cathode layer uniformity. The transition surface greatly enhances the application of polymer slurries.

REFERENCES:
patent: 5949639 (1999-09-01), Maeda et al.
patent: 5959831 (1999-09-01), Maeda et al.
patent: 6072694 (2000-06-01), Hahn et al.
patent: 6191936 (2001-02-01), Webber et al.
patent: 6391379 (2002-05-01), Lessner et al.
patent: 6451074 (2002-09-01), Bluvstein et al.
patent: 7116548 (2006-10-01), Satterfield, Jr. et al.
patent: 7154742 (2006-12-01), Hahn et al.
patent: 7190572 (2007-03-01), Maeda
patent: 2005/0231895 (2005-10-01), Maeda
patent: 2006/0233653 (2006-10-01), Trapalis
Improving Thermal Shock Resistance of Surface Mount Tantalum Capacitors, D.M. Fortin, J.B. Edson, Mar. 23, 1994, R & M Library Citation.

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