US4205996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CoO Free black spinel ceramic pigment containing NiO, Fe2 O3 and Cr2 O3
Assignee: Pemco Corp
•
Filing: 1979-04-26
•
Granted: 1980-06-03
•
Expires: 1999-04-26
Abstract
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 2 O 3 -Cr 2 O 3 -Mn 2 O 3 -V 2 O 3 -Al 2 O 3 system, and they can be used with glaze frits containing up to about 10% ZnO.
Inventors
- 👤 Richard A. Eppler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:03
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0009; C01; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/60; C01P2006/63; C01P2006/64
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
Spinel pigment exhibiting black coloration and having the following net oxide composition expressed in mols: ______________________________________
NiO 0.4-1
CuO 0-0.5
MnO 0-0.6 Group I
Fe.sub.2 O.sub.3
0.2-0.8
Cr.sub.2 O.sub.3
0.2-0.8
Mn.sub.2 O.sub.3
0-0.4
Al.sub.2 O.sub.3
0-0.15
V.sub.2 O.sub.3 0-0.15 Group II
______________________________________ with the provisos that the molar sum of Group I is unity and that the molar sum of Group II is approximately unity.
Claim 2
Dependent Claim
65 words
Spinel pigment exhibiting black coloration and having the following net oxide composition expressed in mols: ______________________________________
NiO 0.4-1
CuO 0-0.5
MnO 0-0.6 Group I
Fe.sub.2 O.sub.3
0.2-0.8
Cr.sub.2 O.sub.3
0.2-0.8
Mn.sub.2 O.sub.3
0-0.4
Al.sub.2 O.sub.3
0-0.15
V.sub.2 O.sub.3 0-0.15 Group II
______________________________________ with the provisos that the molar sum of Group I is unity and that the molar sum of Group II is approximately unity.
Claim 3
Dependent Claim
59 words
The pigment of claim 1 wherein said composition is: ______________________________________
NiO 0.5-1
CuO 0-0.5
MnO 0-0.5 Group I
Fe.sub.2 O.sub.3
0.25-0.75
Cr.sub.2 O.sub.3
0.25-0.75
Mn.sub.2 O.sub.3
0-0.3
Al.sub.2 O.sub.3
0-0.125
V.sub.2 O.sub.3 0-0.125 Group II
______________________________________ with the provisos that the molar sum of Group I is unity and that the molar sum of Group II is approximately unity.
Claim 4
Dependent Claim
30 words
The pigment of claim 1 which contains a small proportion of extender oxide that is not present in the spinel structure and acts essentially as a diluent of the color.
Claim 5
Dependent Claim
35 words
A process for making black ceramic pigment which comprises calcining at a temperature of about 1,900°-2,400° F. a raw batch of ceramic grade raw materials in proportions metered to yield a spinel of claim 1.
Claim 6
Dependent Claim
18 words
A ceramic frit tinted by admixture with a minor proportion of particles of the pigment of claim 1.
Claim 7
Dependent Claim
13 words
A substrate coated with the fired residue of the admixture of claim 5.
Claim 8
Dependent Claim
11 words
The coated substrate of claim 6 which is a glazed tile.
Claim 9
Dependent Claim
19 words
A ceramic body containing a minor proportion of a pigment of claim 1 sufficient for coloring said body grey.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |