Altering the appearance of corundum crystals

Details Altering the appearance of corundum crystals Altering the appearance of corundum crystals

1974-05-08

1976-04-13

Husack, Ralph

Stock material or miscellaneous articles

Metal continuous phase interengaged with nonmetal continuous...

63 32, 106 42, 264 82, 427140, 427162, 427164, 427180, 427201, 427248, 427255, B32B 904, B32B 3500, B05D 506

Patent

active

039505960

ABSTRACT:
A corundum crystal whose surface is altered by contact with a powdered metal oxide colorant at an elevated temperature within the range of 1600.degree.C to a temperature below the fusion temperature of the said powder, said metal oxide colorant consisting essentially of an oxide of titanium and at least one metal oxide selected from the group consisting of iron, chromium, vanadium and nickel, said metal oxide colorant being sufficient to impart color to the surface of the crystal.

REFERENCES:
patent: 988230 (1911-03-01), Verneuil
patent: 1775867 (1930-09-01), Sandmeier
patent: 1814219 (1931-07-01), Jaeger
patent: 2448511 (1948-09-01), Barnes et al.
patent: 2488507 (1949-11-01), Burdick et al.
patent: 2690630 (1954-10-01), Eversole et al.
patent: 3420780 (1969-01-01), Forrat et al.
patent: 3539379 (1970-11-01), Mayer
patent: 3655415 (1972-04-01), Keig et al.
patent: 3713877 (1973-01-01), Kirchner et al.

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