Fishing – trapping – and vermin destroying
Patent
1988-05-09
1990-02-20
Hearn, Brian E.
Fishing, trapping, and vermin destroying
437 81, 437152, 148DIG11, 148DIG37, 357 34, H01L 21265
Patent
active
049026330
ABSTRACT:
A bipolar integrated circuit requiring less silicon area is provided by the use of a three layer epitaxy on top of a substrate. The first epitaxial layer is of the same conductivity type as the substrate and adds additional height to the substrate surrounding the buried layer. The buried layer serves as a collector and it is surrounded by an isolation area. The top two epitaxial layers are of a conductivity type opposite to that of the substrate with the upper most epitaxial layer having a higher dopant density than does the middle epitaxial layer. A master mask is used to provide self-alignment between the isolation area, a collector plug which makes contact to the buried layer, and a base region.
REFERENCES:
patent: Re30282 (1980-05-01), Hunt
patent: 3473977 (1969-10-01), Skansan
patent: 3544863 (1970-12-01), Price
patent: 3622842 (1971-11-01), Oberal
patent: 3638301 (1972-02-01), Matsurua
patent: 3759760 (1973-09-01), Encinas
patent: 3912555 (1975-10-01), Tsuyuki
patent: 3982974 (1976-09-01), Edel
patent: 4111720 (1978-09-01), Michel
patent: 4593457 (1986-06-01), Birrittella
patent: 4717681 (1988-01-01), Curran
patent: 4746629 (1988-05-01), Hanagasaki
patent: 4780430 (1988-10-01), Musumeci
Barbee Joe E.
Hearn Brian E.
McAndrews Kevin
Motorola Inc.
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