US4495118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic plates and method for the production thereof
Assignee: CLAY BURN CERAMICS Co Ltd
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Filing: 1983-04-13
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Granted: 1985-01-22
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Expires: 2003-04-13
Abstract
Abstract Large and thin ceramic plates of, particularly at least 30×30 cm in size and not greater than 20 mm especially not greater than 8 mm in thickness and having oriented crystals are produced by a method comprising drawing a green body from an extruder in a curved shape, cutting and spreading the green body in a plate form, rolling the plates in the same direction as that of drawing, subjecting the rolled plates to the treatment with far infrared rays or high-frequency heating before the plates contain a moisture reduced to less than 15% while the plates are transferred in the same direction as that of drawing, drying the plates thus treated while the plates are further transferred in the same direction, and then firing the plates in a kiln. The ceramic plates are large and thin but nevertheless easy to handle.
Inventors
- 👤 Hideo Ikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/24; B; B28; B28B; B28B11/00; B28B11/003; B28B11/24; B28B11/243; C04B33/02; C04B33/13; C04B33/30; C04B33/32; C04B33/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
104 words
A method for producing ceramic plates which comprises drawing a green body from an extruder in a curved shape, cutting and spreading said green body in a plate form, rolling the resulting green plates in the same direction as that of drawing, subjecting the rolled plates to heat treatment with far infrared rays or high-frequency heating before the plates contain a moisture content reduced to less than 15% while the plates are transferred in the same direction as that of drawing, drying the plates thus treated while the plates are further transferred in the same direction, and then firing the plates in a kiln.
Claim 2
Independent Claim
104 words
A method for producing ceramic plates which comprises drawing a green body from an extruder in a curved shape, cutting and spreading said green body in a plate form, rolling the resulting green plates in the same direction as that of drawing, subjecting the rolled plates to heat treatment with far infrared rays or high-frequency heating before the plates contain a moisture content reduced to less than 15% while the plates are transferred in the same direction as that of drawing, drying the plates thus treated while the plates are further transferred in the same direction, and then firing the plates in a kiln.
Claim 3
Dependent Claim
13 words
The method according to claim 1, wherein said extruder is a deairing pug-mill.
Claim 4
Dependent Claim
19 words
The method according to claim 1, wherein calcining is conducted after the drying step and before the firing step.
Claim 5
Dependent Claim
32 words
The method according to claim 1, wherein the firing is conducted in a roller hearth kiln while the plates are transferred in the same direction as that of drawing from the extruder.
Claim 6
Dependent Claim
57 words
The method according to claim 4, wherein cold air is sprayed through slit nozzles against the plates at both the top and bottom surfaces thereof, directly after the plates have been transformed into a vitreous phase in the roller hearth kiln and before the plates begin to be solidified, thereby quenching the plates to a solid state.
Claim 7
Dependent Claim
24 words
The method according to claim 5, wherein the quenching is conducted in a cooling rate of 100° C./minute at the surfaces of the plates.
Claim 8
Dependent Claim
26 words
The method according to claim 1, wherein the temperature and the period of time for firing in a kiln are sufficient to vitrify the green body.
Claim 9
Dependent Claim
35 words
The method according to claim 1, wherein the temperature and the period of time for firing in a kiln are insufficient to eliminate the orientability of crystals in the direction of drawing the green body.
Claim 10
Dependent Claim
25 words
The method according to claim 1, wherein the heat treatment with, far infrared rays or high-frequency heating is conducted before or during the rolling step.
Claim 11
Dependent Claim
20 words
The method according to claim 9, wherein the heat treatment is conducted at a temperature of 30° to 60° C.
Claim 12
Dependent Claim
28 words
The method according to claim 1, wherein the drying is conducted at a temperature of 70° to 550° C. for a period of 30 minutes to 2 hours.
Claim 13
Dependent Claim
13 words
The method according to claim 1, wherein the plates are glazed after drying.
References Cited (Backward Citations)
US2143003A
Cited
US2454708A
Cited
US3487135A
Cited
US3442994A
Cited
US3904352A
Cited
US4183885A
Cited
JPS5134213A
Cited
JPS5134908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |