US4340645A
Expired / Lapsed
US
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Leadless glazes for whiteware
Assignee: Bayer Corp
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Filing: 1981-05-11
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Granted: 1982-07-20
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Expires: 2001-05-11
Abstract
Abstract The present invention is directed to ceramic frits for use in ceramic glazes and to the glazes themselves which when fired consist essentially of: -Constituent % by Weight -Alkali -(K2O, Na2O, Li2O) 3.5 to 6.5 -ZnO 6.0 to 12.5 -CaO 6.0 to 12.0 -MgO 0 to 0.7 -BaO 0 to 5.0 -SrO 1.7 to 4.0 -B2O3 2.0 to 6.0 -Al2O3 7.0 to 12.0 -SiO2 53.0 to 61.0 -ZrO2 0 to 8.0 -
Inventors
- 👤 Eugene F. O'Conor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:40
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/02; C03C8/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
A ceramic frit which, when smelted, consists essentially of: (a) from 4.0 to 6.5 percent by weight of a member selected from the group consisting of potassium oxide, sodium oxide, lithium oxide and mixtures thereof; (b) from 7.0 to 12.5 percent by weight of zinc oxide; (c) from 7.0 to 12.0 percent by weight of calcium oxide; (d) from 0 to 0.7 percent by weight of magnesium oxide; (e) from 0 to 5.0 percent by weight of barium oxide; (f) from 2.0 to 4.0 percent by weight of strontium oxide; (g) from 2.5 to 6.0 percent by weight of boric oxide; (h) from 7.0 to 8.5 percent by weight of aluminum oxide; (i) from 54.0 to 60.0 percent by weight of silica; and, (j) from 0 to 1.0 percent by weight of zirconium oxide; all said percents by weight being based on the total weight of components (a) through (j).
Claim 2
Dependent Claim
150 words
A ceramic frit which, when smelted, consists essentially of: (a) from 4.0 to 6.5 percent by weight of a member selected from the group consisting of potassium oxide, sodium oxide, lithium oxide and mixtures thereof; (b) from 7.0 to 12.5 percent by weight of zinc oxide; (c) from 7.0 to 12.0 percent by weight of calcium oxide; (d) from 0 to 0.7 percent by weight of magnesium oxide; (e) from 0 to 5.0 percent by weight of barium oxide; (f) from 2.0 to 4.0 percent by weight of strontium oxide; (g) from 2.5 to 6.0 percent by weight of boric oxide; (h) from 7.0 to 8.5 percent by weight of aluminum oxide; (i) from 54.0 to 60.0 percent by weight of silica; and, (j) from 0 to 1.0 percent by weight of zirconium oxide; all said percents by weight being based on the total weight of components (a) through (j).
Claim 3
Dependent Claim
35 words
A ceramic glaze comprising at least 80 percent by weight of the frit of claim 1, with the balance being selected from the group consisting of bentonite, clay, flint, alumina, pigments, opacifiers and mixtures thereof.
Claim 4
Dependent Claim
22 words
A product produced by applying the glaze of claim 2 to a ceramic body and firing the coated body at 1900°-2200° F.
Claim 5
Dependent Claim
155 words
A ceramic glaze which, after firing, consists essentially of: (a) from 3.5 to 6.5 percent by weight of a member from the group consisting of potassium oxide, sodium oxide, lithium oxide and mixtures thereof; (b) from 6.0 to 12.5 percent by weight of zinc oxide; (c) from 6.0 to 12.0 percent by weight of calcium oxide; (d) from 0 to 0.7 percent by weight of magnesium oxide; (e) from 0 to 5.0 percent by weight of barium oxide; (f) from 1.7 to 4.0 percent by weight of strontium oxide; (g) from 2.0 to 6.0 percent by weight of boric acid; (h) from 7.0 to 12.0 percent by weight of aluminum oxide; (i) from 53.0 to 61.0 percent by weight of silica; (j) from 0 to 8.0 percent by weight of zirconium oxide; all such weights being based on the total weight of components (a) through (j) plus any additional pigments added to color such glaze.
Claim 6
Dependent Claim
155 words
A ceramic glaze which, after firing, consists essentially of: (a) from 3.5 to 6.5 percent by weight of a member from the group consisting of potassium oxide, sodium oxide, lithium oxide and mixtures thereof; (b) from 6.0 to 12.5 percent by weight of zinc oxide; (c) from 6.0 to 12.0 percent by weight of calcium oxide; (d) from 0 to 0.7 percent by weight of magnesium oxide; (e) from 0 to 5.0 percent by weight of barium oxide; (f) from 1.7 to 4.0 percent by weight of strontium oxide; (g) from 2.0 to 6.0 percent by weight of boric acid; (h) from 7.0 to 12.0 percent by weight of aluminum oxide; (i) from 53.0 to 61.0 percent by weight of silica; (j) from 0 to 8.0 percent by weight of zirconium oxide; all such weights being based on the total weight of components (a) through (j) plus any additional pigments added to color such glaze.
Claim 7
Dependent Claim
22 words
A product produced by applying the glaze of claim 4 to a ceramic body and firing the coated body at 1900°-2200° F.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |