Capacitor with ceramic chip held in compression both laterally and axially by a glass sleeve

Claim 1

A capacitor comprising: a ceramic chip having a planar end face at two opposite ends, said end faces being parallel to each other, a pair of conductive metal heads, each head including a planar face and a cyindrical peripheral sidewall, the sidewall having a central axis and the planar face lying normal to said central axis, one of said planar faces lying adjacent to each of said end faces; a band of malleable metal on said peripheral sidewall extending continuously around the same; a glass sheath having an internal cylindrical sidewall, all of the chip and at least part of both heads and of their bands of malleable metal lying axially within the sheath, the heads and chip being held by the sheath in a compressive electrically conductive joinder by axial force exerted by the sheath, the heads and chip not being joined to each other, but instead remaining as free bodies without bonding or discontinuous interconnection between them, the sidewall of the sheath bearing against the malleable band to form a surface-to-surface, nonbonded, contiguous, hermetically sealing joinder, the band conforming to the surface configuration of the sidewaLl of the sheath, the chip, heads and sheath being held assembled only by compressive force exerted by the sheath, the malleable band serving as a stress-relieving element to relieve force loads derived from temperature change and external forces, said relief occurring as a consequence of deformation inherent in the malleability and of the absence of joinder of a class resistive to tensile forces, and the sheath being in gripping contact with the chip so as to hold it against shifting or cocking.

Claim 10

The method of making a capacitor comprising a ceramic chip, a pair of metal heads at opposite ends of the chip, and a glass sheath surrounding the chip and at least parts of each head and making a fluid-tight fit with both of said heads, said method comprising the following steps in the order recited: a. Forming a loose assembly of the chip, heads and sheath and placing the same in a vacuum oven; b. Evacuating the oven and heating the assembly at least to the softening point of the glass sheath, whereby the sheath makes a fluid-tight fit with both heads; c. Raising the pressure in said oven while maintaining the glass in the said softened condition to exert a differential pressure which creates a force that will press the sheath against the chip; and d. Cooling the assembly.

Claim 11

The method of making a capacitor comprising a ceramic chip, a pair of metal heads at opposite ends of the chip, and a glass sheath surrounding the chip and at least parts of each head and making a fluid-tight fit with both of said heads, said method comprising the following steps in the order recited: a. Forming a loose assembly of the chip, heads and sheath and placing the same in a vacuum oven; b. Evacuating the oven and heating the assembly at least to the softening point of the glass sheath, whereby the sheath makes a fluid-tight fit with both heads; c. Raising the pressure in said oven while maintaining the glass in the said softened condition to exert a differential pressure which creates a force that will press the sheath against the chip; and d. Cooling the assembly.