US3871890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for glazing ceramic ware
Assignee: SCM Corp
•
Filing: 1973-11-19
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Granted: 1975-03-18
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Expires: 1993-11-19
Abstract
Abstract Disclosed are compositions and methods for glazing low-expansion ceramic ware with an opaque, non-porous, acid-resistant, lowexpansion, semi-crystalline glass-ceramic glaze which can be subjected to relatively high firing temperatures (relatively high with respect to firing temperatures for low-expansion glazes) without the formation of ''''wash boarding'''' or other surface defects associated with overfiring. The compositions are lithium aluminosilicate frits containing sufficient ZrO2 so that zirconia is present as a crystalline phase in the fired glaze. The invention shows particular advantage for making glazes of adjustable and low expansion for thermal shock-resistant ceramic whiteware, for example, dinnerware, cookware and ceramic tile.
Inventors
- 👤 Richard Andrew Eppler
- 👤 Eugene F O'conor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:52
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/04; C03C10/00; C03C10/0018; C03C10/0027; C03C8/06; C03C8/08; C03C8/10; C03C8/12; C03C2205/00; C03C2205/02; C03C2209/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
AS COMPONENT FOR GLAZING LOW-EXPANSION CERAMIC WHITEWARE WITH A SUBSTANTIALLY NON-POROUS, ACID-RESISTANT, OPAQUE GLAZE, A SUBSTANTIALLY WATER-INSOLUBLE CERAMIC FRIT BEING SUBSTANTIALLY ENTIRELY IN THE VITREOUS STATE AS FRIT PARTICLES, SAID FRIT AFTER MELTING INTO A FLUENT VITREOUS STATE BEING THERMALLY AUTOCRYSTALLIZABLE TO A LOW-EXPANSION, SEMI-CRYSTALLINE GLASSCERAMIC GLAZE CONTAINING ZIRCONIA OR ZIRCON AS ONE OF THE CRYSTALLINE PHASES AND HAVING A COEFFICIENT OF THERMAL EXPANSION OF LESS THAN 5X10-6/*C., SAID FRIT CONSISTING ESSENTIALLY OF:
Claim 2
Dependent Claim
73 words
AS COMPONENT FOR GLAZING LOW-EXPANSION CERAMIC WHITEWARE WITH A SUBSTANTIALLY NON-POROUS, ACID-RESISTANT, OPAQUE GLAZE, A SUBSTANTIALLY WATER-INSOLUBLE CERAMIC FRIT BEING SUBSTANTIALLY ENTIRELY IN THE VITREOUS STATE AS FRIT PARTICLES, SAID FRIT AFTER MELTING INTO A FLUENT VITREOUS STATE BEING THERMALLY AUTOCRYSTALLIZABLE TO A LOW-EXPANSION, SEMI-CRYSTALLINE GLASSCERAMIC GLAZE CONTAINING ZIRCONIA OR ZIRCON AS ONE OF THE CRYSTALLINE PHASES AND HAVING A COEFFICIENT OF THERMAL EXPANSION OF LESS THAN 5X10-6/*C., SAID FRIT CONSISTING ESSENTIALLY OF:
Claim 3
Dependent Claim
8 words
The component of claim 1 having the composition:
Claim 4
Dependent Claim
57 words
A composition for glazing ceramic ware, said composition comprising 100 parts of the frit of claim 1; 0 to 15 parts ceramic clay (other than a montmorillonite clay); 0 to 5 parts montmorillonite; 0 to 20 parts ceramic colorant; 0 to 20 parts ceramic opacifier; 0 to about 0.4 part electrolyte; and 0 to 90 parts water.
Claim 5
Dependent Claim
26 words
The composition of claim 3 wherein preparatory to application to a ceramic body, not substantially less than about 97% of all ingredients pass a 325-mesh screen.
Claim 6
Dependent Claim
17 words
The composition of claim 3 in the form of a slip containing 15 to 90 parts water.
Claim 7
Dependent Claim
21 words
The component of claim 1 useful at a firing temperature of about 100* to 300C, above the liquidus of the component.
Claim 8
Dependent Claim
15 words
The component of claim 1 useful at a firing temperature of about 975* to 1250*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |