Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1987-05-18
1988-11-29
Grimley, Arthur T.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
174 5061, 428432, 501 32, 501 68, B32B 1706
Patent
active
047883820
ABSTRACT:
A duplex glass preform for forming hermetic glass-to-metal seals of the compression type. The duplex glass preform comprises a glass infrasturcture or matrix having at least one end thereof modified by the selective distribution therein of ceramic particles. The ceramic particles are selectively distributed to form a ceramic density gradient having the largest concentration of ceramic particles at the surface and gradually decreasing with depth. The duplex glass preform of the present invention has utility in forming glass-to-metal compression seals in hybrid metal packages containing microcircuit chips. The duplex glass preform may be used in the normal insulative fashion or as a conductive member.
REFERENCES:
patent: 4186023 (1980-01-01), Dumesnil et al.
patent: 4430376 (1984-02-01), Box
patent: 4587144 (1986-05-01), Kellerman et al.
patent: 4716082 (1987-12-01), Ahearn et al.
Ahearn John E.
Frates Raymond A.
Girard Dennis
Koepke Richard A.
Manon C. Dodd
Grimley Arthur T.
Isotronics, Inc.
Tone David A.
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