Capacitor with molded header including strengthening material

Claim 1

An electrolytic capacitor comprising a casing having a closed bottom end and an open upper end; a capacitor section located within said casing having anode foils and cathode foils; porous separators for said foils; an electrolyte impregnating said foils including dimethyl formamide solvent; a header sealed to the open end of said casing and comprising molded plastic material characterized as being dimensionally stable and resistant to chemical attack by said dimethyl formamide at temperatures in excess of 85° C.; and including strengthening material selected from the group consisting of glass fibers and minerals; conductive retainer means at the bottom of said casing adapted to conduct heat from one of said foils to said casing; said header being formed to define further retainer means including a plurality of ribs extending radially of said header and depending downwardly therefrom into engagement with the upper end of the capacitor section, and a bolster ring extending about the lower surface of said header and integral with the distal ends of said ribs, said further retainer means inducing a force on said capacitor section to urge said capacitor section in pressure contact with said first retainer means, said first retainer means and said further retainer means cooperating to fix said capacitor section against horizontal, vertical and rotational movement.