Fishing – trapping – and vermin destroying
Patent
1995-09-26
1997-07-15
Nguyen, Tuan H.
Fishing, trapping, and vermin destroying
437 89, 437 90, 437 99, 437131, H01L 21265
Patent
active
056482809
ABSTRACT:
A base region structure involved in a bipolar transistor, wherein the base region comprises a compound semiconductor epitaxial layer formed in a recessed portion provided by etching in an upper region of the semiconductor substrate and the recessed portion has a depth corresponding to a thickness of the compound semiconductor epitaxial layer so that the base region has a top surface positioned at the same level as a top surface of the semiconductor substrate.
REFERENCES:
patent: 4910164 (1990-03-01), Shichijo
patent: 5137840 (1992-08-01), Desilets et al.
NEC Corporation
Nguyen Tuan H.
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