US3862844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
SnO{HD 2 {B containing lead silicate glass having a low melting point
Assignee: Ceramic Color & Chemical Manuf
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Filing: 1972-11-03
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Granted: 1975-01-28
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Expires: 1992-11-03
Abstract
Abstract A low melting point glass flux or frit is provided which is especially adapted for use as a protective layer for overglaze decalcomanias and applied ceramic decorations and is substantially resistant to both acid and alkali attack, to mechanical abrasion, and inhibits release of lead, cadmium and other toxic substances normally found in decalcomanias and vitreous ceramic decorations. The frit is comprised of increments of lead oxide, silicon dioxide, cadmium oxide and tin oxide, and optionally titanium dioxide. It can include substituents of conventional frits as well.
Inventors
- 👤 Jr William F Wenning
- 👤 Louis A Blanco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:50
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/062; C03C3/07; C03C3/072; C03C4/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
25 words
A low melting point glass in accordance with claim 1 comprising, in addition, from about 1 percent to about 4 percent by weight zirconium dioxide.
Claim 2
Dependent Claim
21 words
A low melting point glass in accordance with claim 1, including, in addition, up to about 6 percent by weight alumina.
Claim 3
Dependent Claim
15 words
A low melting point glass in accordance with claim 1, wherein the glass is prefused.
Claim 4
Dependent Claim
14 words
A low melting point glass in accordance with claim 1 having the following formulation:
Claim 5
Dependent Claim
20 words
A low melting point glass in accordance with claim 5, further including 1 to 4 percent by weight of ZrO2.
Claim 6
Dependent Claim
14 words
A low melting point glass in accordance with claim 5 of the following compositions:
Claim 7
Dependent Claim
68 words
A low melting point glass in accordance with claim 1 wherein said alkali oxides comprise a member selected from the group consisting of sodium oxide and potassium oxide and mixtures thereof, in an amount of within the range of from about 3 percent to about 11 percent by weight, and lithium oxide in an amount within the range of from 0 percent to about 4 percent by weight.
Claim 8
Dependent Claim
33 words
A low melting point glass in accordance with claim 1 wherein said lead oxide is present in an amount within the range of from about 25 percent to about 35 percent by weight.
Claim 9
Dependent Claim
51 words
A low melting point glass in accordance with claim 9 wherein said alkali oxides comprise a member selected from the group consisting of sodium oxide and potassium oxide and mixtures thereof, and lithium oxide in an amount within the range of from about 0.5 percent to about 1.5 percent by weight.
Claim 10
Dependent Claim
15 words
A low melting point glass in accordance with claim 5 in admixture with inorganic pigments.
Claim 11
Dependent Claim
20 words
A low melting point glass in accordance with claim 11 wherein said inorganic pigments are low melting point vitreous colors.
References Cited (Backward Citations)
US2225162A
Cited
US2245541A
Cited
US2278868A
Cited
US2338099A
Cited
US2356317A
Cited
US3383225A
Cited
US2909438A
Cited
US3055762A
Cited
US3099569A
Cited
US3331777A
Cited
US3586522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |