Fused cathode electrolytic capacitors

Claim 2

An electrolytic capacitor comprising a capacitor cartridge in the form of a roll comprising a spirally wound set of layers of elongated alternately superposed metallic foil and dielectric strips, the metallic foil strips forming an anode foil of narrower width than the dielectric strips in insulated relation therebetween and a cathode foil positioned with one of its edges protruding in exposed relation beyond the corresponding edges of the dielectric sheets at one end of the roll, and said end of the roll having a pattern of rectilinear narrow width, elongated trough depressions therein formed in the protruding cathode foil edges of adjacent convoluted turns completly spanning said end along trough axes paralleling plural diameters of the roll extending crosswise of each other, said trough depressions having continuous trough walls formed of thermally fused-together contiguous edge portions immediately bordering on the trough depressions of all the mutually adjacent protruding cathode foil edges at said end, said protruding cathode foil edges being fused together only along the mutually touching edge portions bounding the trough depressions.

Claim 3

An electrolytic capacitor as defined in claim 1, wherein the trough depressions of thermally fused bounding cathode foil edges are arranged in a first group of elongated straight trough elements spanning the roll and paralleling a diametric axis thereof and a second group of straight trough elements spanning the roll and extending perpendicular to the trough elements of the first group.

Claim 4

An electrolytic capacitor comprising an outer metallic case, a top seal for said case having a pair of terminal members extending therethrough, a capacitor cartridge within said case in the form of a roll comprising a spirally wound set of layers of elongated alternately superposed metallic foil and dielectric strips, the metallic foil strips forming an anode foil of narrower width than the dielectric strips in insulated relation therebetween and a cathode foil positioned with one of its edges protruding in exposed relation beyond the corresponding edges of the dielectric sheets at one end of the roll, tab members secured to said anode foil and cathode foil and to said terminal members and said end of the roll having a pattern of rectilinear narrow width, elongated trough depressions therein formed in the protruding cathode foil edges of adjacent convoluted turns completly spanning said end along trough axes paralleling plural diameters of the roll extending crosswise of each other, said trough depressions having continuous trough walls formed of thermally fused-together contiguous edge portions immediately bordering on the trough depressions of all the mutually adjacent protruding cathode foil edges at said end, said protruding cathode foil edges being fused together only along the mutually touching edge portions bounding the trough depressions.

Claim 5

An electrolytic capacitor comprising an outer metallic case, a top seal for said case having a pair of terminal members extending therethrough, a capacitor cartridge within said case in the form of a roll comprising a spirally wound set of layers of elongated alternately superposed metallic foil and dielectric strips, the metallic foil strips forming an anode foil of narrower width than the dielectric strips in insulated relation therebetween and a cathode foil positioned with one of its edges protruding in exposed relation beyond the corresponding edges of the dielectric sheets at one end of the roll, tab members secured to said anode foil and cathode foil and to said terminal members and said end of the roll having a pattern of rectilinear narrow width, elongated trough depressions therein formed in the protruding cathode foil edges of adjacent convoluted turns completly spanning said end along trough axes paralleling plural diameters of the roll extending crosswise of each other, said trough depressions having continuous trough walls formed of thermally fused-together contiguous edge portions immediately bordering on the trough depressions of all the mutually adjacent protruding cathode foil edges at said end, said protruding cathode foil edges being fused together only along the mutually touching edge portions bounding the trough depressions.

Claim 6

An electrolytic capacitor as defined in claim 3, wherein the trough depressions of thermally fused bounding cathode foil edges are arranged in a first group of elongated straight trough elements spanning the roll and paralleling a diametric axis thereof and a second group of straight trough elements spanning the roll and extending perpendicular to the trough elements of the first group.