Uniform migration of an annular shaped molten zone through a sol

Details Uniform migration of an annular shaped molten zone through a sol Uniform migration of an annular shaped molten zone through a sol

1975-12-31

1976-12-21

Ozaki, G.

Metal treatment

Compositions

Heat treating

148171, 148172, 148177, 148179, 148186, 148187, 148188, 252 623GA, 252 623E, H01L 21228

Patent

active

039986616

ABSTRACT:
Annular regions of a predetermined type conductivity are produced in a body of semiconductor material by a temperature gradient zone melting process embodying both noncentro-symmetric rotation of the body as well as secondary rotation of the body about its vertical axis.

REFERENCES:
patent: 2813048 (1957-11-01), Pfann
patent: 3897277 (1975-07-01), Blumenfeld
patent: 3898106 (1975-08-01), Cline et al.
patent: 3899361 (1975-08-01), Cline et al.
patent: 3899362 (1975-08-01), Cline et al.
patent: 3901736 (1975-08-01), Anthony et al.
patent: 3902925 (1975-09-01), Anthony et al.
patent: 3904442 (1975-09-01), Anthony et al.
patent: 3910801 (1975-10-01), Cline et al.
patent: 3936319 (1976-02-01), Anthony et al.
patent: 3956023 (1976-05-01), Cline et al.

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