US4720438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded clay article coated with pearl pigment
Assignee: Merck Patent GmbH
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Filing: 1986-06-13
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Granted: 1988-01-19
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Expires: 2006-06-13
Abstract
Abstract A process for producing a molded clay article having pearly luster, comprised coating a molded clay article with a mixture of (1) a glaze adjusted to have the sum of the R2O groups in the Seger formula in the range of 0 to 0.55 mole and (2) a pearlescent pigment comprising mica powder particles having a coating of transparent metal oxide; and firing the coated clay article at a temperature not exceeding 900 DEG C.
Inventors
- 👤 Takaji Watanabe
- 👤 Katsuhisa Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:10
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5022; C04B41/80; C04B41/81; C04B41/85; C04B41/86
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
94 words
A process for producing a molded clay article having pearly luster, comprising coating a molded clay article with a mixture of (1) a glaze adjusted to have the sum of the R 2 O groups in the Seger formula in the range of 0 to 0.55 mol and (2) a pearlescent pigment comprising mica powder particles having a coating of transparent metal oxide wherein the pearl pigment is present in an amount up to about 33 wt% of the glaze composition; and firing the coated clay article at a temperature not exceeding 900° C.
Claim 2
Dependent Claim
94 words
A process for producing a molded clay article having pearly luster, comprising coating a molded clay article with a mixture of (1) a glaze adjusted to have the sum of the R 2 O groups in the Seger formula in the range of 0 to 0.55 mol and (2) a pearlescent pigment comprising mica powder particles having a coating of transparent metal oxide wherein the pearl pigment is present in an amount up to about 33 wt% of the glaze composition; and firing the coated clay article at a temperature not exceeding 900° C.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the pearly pigment comprises mica platelets each having a surface coating of titanium dioxide.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the grain size of the pearly pigment ranges from about 15 to 150 μm.
Claim 5
Dependent Claim
22 words
A process according to claim 2, wherein the pearly pigment is coated with titanium dioxide and a coating of a colored oxide.
Claim 6
Dependent Claim
20 words
A process according to claim 1, wherein the glaze is present as frit glaze, mint green glaze, or mixtures thereof.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the pearl pigment is present in the range of 5-20%.
Claim 8
Dependent Claim
17 words
A process according to claim 1, wherein the firing temperature ranges from about 600° to 900° C.
Claim 9
Dependent Claim
25 words
A process according to claim 1, wherein the R 2 O oxides in the Seger formula are Na 2 O, K 2 O or both.
Claim 10
Dependent Claim
13 words
A process of claim 1, wherein the molded clay article has been pre-fired.
Claim 11
Dependent Claim
12 words
A process of claim 1, wherein the molded clay article is raw.
Claim 12
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 1.
Claim 13
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 2.
Claim 14
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 4.
Claim 15
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 5.
Claim 16
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 6.
Claim 17
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 7.
Claim 18
Dependent Claim
14 words
A molded clay article having pearly luster, made by the process of claim 8.
References Cited (Backward Citations)
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US3402060A
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US3510343A
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US3711368A
Cited
US3874890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |