Fishing – trapping – and vermin destroying
Patent
1991-07-09
1992-07-14
Hearn, Brian E.
Fishing, trapping, and vermin destroying
437 27, 437149, 437953, 148DIG111, H01L 2122
Patent
active
051302721
ABSTRACT:
Along the outline of a first doped region, a first mask is formed. The mask is made up of a dielectric opposed to the oxygen diffusion. Another mask is created within this first mask, using a process of selective thermal oxidation. The second mask is used to implant dopant in a second region which will only be defined along the outlines of the first region.
REFERENCES:
patent: 3793721 (1974-02-01), Wakefield et al.
patent: 4503598 (1985-03-01), Vora et al.
patent: 4774198 (1988-09-01), Contiero et al.
patent: 4879254 (1989-11-01), Tsuzuki et al.
patent: 4960723 (1990-10-01), Davies
Ferla Giuseppe
Lanza Paolo
Magro Carmelo
Chaudhari C.
Hearn Brian E.
SGS--Thomson Microelectronics S.r.l.
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