US3628989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of glazed ceramic bodies, in particular tiles, with only one firing
Assignee: Individual
•
Filing: 1968-10-01
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Granted: 1971-12-21
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Expires: 1988-10-01
Abstract
Abstract In this process of glazing ceramic bodies, especially tiles, the latter are coated in raw, predried condition with a vitreous glaze admixed with about 25-35 percent of refractory clays and/or kaolin having a grain size of one micron or less, and, after drying the glaze, the bodies are fired only once.
Inventors
- 👤 Ferruccio Solmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C4/00; C04B41/45; C04B41/50; C04B41/5022; C04B41/80; C04B41/81; C04B41/85; C04B41/86; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
Process according to claim 1, in which said coating is effected with a vitreous glaze admixed with about 25 percent of the refractory clay or kaolin having a grain size of at most about 1 micron, and with a further 10 percent of another more refractory clay or kaolin having a grain size between 1 and 8 microns.
Claim 2
Dependent Claim
75 words
Process according to claim 1, in which said coating is effected with a mixture consisting of 25 percent of clay A, 10 percent of clay B and 65 percent of glaze crystal C, the respective compositions of which are: Clay A: SiO2-56.5%; Al2O3-26%; Fe2O3-2.5%; TiO2-0.2; CaO-2%; MgO-2.5%; K2O+Na2O-6%; H2O loss at firing- 4.3%. Clay B: SiO2-58%; Al2O3-29.1%; Fe2O3-0.5%; CaO-0.5%; K2O+Na2O-3.6%; H2O loss at firing-8.3%. Glaze crystal C: PbO-0.106; K2O-0.262; Na2O-0.264; CaO-0.262; MgO-0.106; Al2O3-0.174; SiO2-5.08; B2O3-0.94.
Claim 3
Dependent Claim
53 words
Process according to claim 1, in which said coating is effected by applying a first layer of the glaze admixed with the refractory clays, kaolin or mixtures thereof in aqueous suspension and, on top of said first layer, a second very thin layer of unadmixed glaze, whereby a brilliant surface finish is obtained.
Claim 4
Dependent Claim
75 words
Process according to claim 1, in which said coating is effected by applying onto the ceramic body the glaze admixed with the refractory clays, kaolin or mixtures thereof and dispersed in a quantity of water sufficient to cleanse the uppermost surface of the glaze so that substantially all particles of clay and kaolin are removed from the said surface during absorption of the water by the ceramic body, whereby a brilliant surface finish is obtained.
Claim 5
Dependent Claim
87 words
Process according to claim 1, for the manufacture of ceramic wall and floor tiles, in which the raw ceramic tiles are formed by compression in the tile molds, then dried; a predetermined surface of the tile is then coated with the vitreous glaze admixed with the refractory clays, kaolin or mixtures thereof, said coating being effected with a screen glazer; the coated tile is then dried and fired once in a kiln on a refractory setter slab which holds it in horizontal position through the firing operation.
Claim 6
Dependent Claim
53 words
Process according to claim 2, in which said coating is effected by applying a first layer of the glaze admixed with the refractory clays, kaolin or mixtures thereof in aqueous suspension and, on top of said first layer, a second very thin layer of unadmixed glaze, whereby a brilliant surface finish is obtained.
Claim 7
Dependent Claim
75 words
Process according to claim 2, in which said coating is effected by applying onto the ceramic body the glaze admixed with the refractory clays, kaolin or mixtures thereof and dispersed in a quantity of water sufficient to cleanse the uppermost surface of the glaze so that substantially all particles of clay and kaolin are removed from the said surface during absorption of the water by the ceramic body, whereby a brilliant surface finish is obtained.
Claim 8
Dependent Claim
87 words
Process according to claim 2, for the manufacture of ceramic wall and flooR tiles, in which the raw ceramic tiles are formed by compression in the tile molds, then dried; a predetermined surface of the tile is then coated with the vitreous glaze admixed with the refractory clays, kaolin or mixtures thereof, said coating being effected with a screen glazer; the coated tile is then dried and fired once in a kiln on a refractory setter slab which holds it in horizontal position through the firing operation.
Claim 9
Dependent Claim
53 words
Process according to claim 3, in which said coating is effected by applying a first layer of the glaze admixed with the refractory clays, kaolin or mixtures thereof in aqueous suspension and, on top of said first layer, a second very thin layer of unadmixed glaze, whereby a brilliant surface finish is obtained.
Claim 10
Dependent Claim
74 words
Process according to claim 3, in which said coating is effected by applying onto the ceramic body the glaze admixed with the refractory clays, kaolin or mixtures thereof and dispersed in a quantity of water sufficient to cleanse the uppermost surface of the glaze so that substantially all particles of clay and kaolin are removed from said surface during absorption of the water by the ceramic body, whereby a brilliant surface finish is obtained.
Claim 11
Dependent Claim
86 words
Processing according to claim 3, for the manufacture of ceramic wall and floor tiles, in which the raw ceramic tiles are formed by compression in tile molds, then dried; a predetermined surface of the tile is then coated with the vitreous glaze admixed with the refractory clays, kaolin or mixtures thereof, said coating being effected with a screen glazer; the coated tile is then dried and fired once in a kiln on a refractory setter slab which holds it in horizontal position through the firing operation.
Claim 12
Dependent Claim
21 words
Once-fired glazed ceramic bodies, in particular tiles, without dunting or damaging effects, as obtained by the process according to claim 1.
References Cited (Backward Citations)
US2241705A
Cited
US2844693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |