Altering the appearance of corundum crystals

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

1976-03-08

1977-08-02

Robinson, Ellis

Stock material or miscellaneous articles

Metal continuous phase interengaged with nonmetal continuous...

63 32, 106 42, 264 82, 427140, 427162, 427255, 428543, 428409, B32B 904, B32B 3500, B05D 506

Patent

active

040397262

ABSTRACT:
The appearance of a corundum crystal is altered by subjecting the crystal to an elevated temperature while maintaining the crystal in contact with a powder comprising a major amount of alumina and a minor amount of a metal oxide colorant.

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
patent: 2488507 (1949-11-01), Burdick
patent: 2690630 (1964-10-01), Eversole
patent: 3420780 (1969-01-01), Forrat
patent: 3539379 (1970-11-01), Mayer
patent: 3655415 (1972-04-01), Keig
patent: 3713877 (1973-01-01), Kirchner

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