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Primary Examiner: Vertiz, O. R.
Assistant Examiner: Bell, Mark
Attorney: Douthitt; Merton H.

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Title: CoO Free black spinel ceramic pigment containing NiO, Fe.sub.2 O.sub.3 and Cr.sub.2 O.sub.3

Abstract: Although free of CoO, the present spinel ceramic pigments have intensity of black coloration comparable to those using cobalt; they are nickel-rich, selected compositions in the NiO-MnO-CuO-Fe.sub.2 O.sub.3 -Cr.sub.2 O.sub.3 -Mn.sub.2 O.sub.3 -V.sub.2 O.sub.3 -Al.sub.2 O.sub.3 system, and they can be used with glaze frits containing up to about 10% ZnO.

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Inventors: Eppler, Richard A. (Timonium, MD, US)

Application Number: 033440
Filing Date: 1979-04-26
Publication_date: 1980-06-03
Assignee: SCM Corporation (Cleveland, OH)
Primary Class(es): 106/453 106/426
Other Classes:
US Patent Ref:

2309173	Jan, 1943	Diehl	106/304.
2811463	Oct, 1957	Burgyan	106/304.
3528839	Sep, 1970	Weber	106/302.
3561989	Feb, 1971	Weber	106/304.
4075029	Feb, 1978	Nuss	106/302.

Other Refs: Other References: "Classification and Chemical Descriptions of Mixed Metal Oxide Inorganic Colored Pigments", The Dry Color Manufacturer's Association, Arlington, Va., pp. 7 & 18.