Ceramic, preparation thereof and electronic circuit substrate by

Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture

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428209, 428210, 428212, 428901, 501 5, 501 17, 501 18, 501 22, 501 62, 501 74, B32B 310, B32B 300, C03C 1004, C03C 814

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047599650

ABSTRACT:
A ceramic comprises therein two or more dielectric portions having different dielectric constants formed by filling of one or more vacant spaces provided within a dielectric porcelain, a semiconductor porcelain as a precursor of said dielectric porcelain or a molded product as a precursor of said semiconductor procelain with one or more kinds of materials capable of becoming to have different dielectric constants from said dielectric porcelain and subsequent calcination.

REFERENCES:
patent: 4424251 (1984-01-01), Sugishita et al.
patent: 4582745 (1986-04-01), Schnable
patent: 4608316 (1986-08-01), Toda et al.
patent: 4609582 (1986-09-01), Joorman et al.

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