US4224074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-toxic frits for decorating glass, glass-ceramic and ceramic articles
Assignee: Corning Glass Works
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Filing: 1979-10-01
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Granted: 1980-09-23
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Expires: 1999-10-01
Abstract
Abstract This invention is directed to the production of frits useful in decorating glazes and enamels for glass, glass-ceramic, and ceramic food service ware which exhibit coefficients of thermal expansion (20°-300° C.) between about 50-110×10 -7 /°C., a viscosity suitable for firing at about 650°-775° C., good glass stability, high gloss, and excellent resistance to attack by acids and bases, especially detergents such as are used in commercial dishwashers. The frits consist essentially, expressed in weight percent on the oxide basis as calculated from the batch, of: SiO 2 :29-55 B 2 O 3 :7-31 Al 2 O 3 :2-8 ZrO 2 :5-16 Na 2 O:4- 20 Li 2 O:0-7 Na 2 O+Li 2 O:6-24 F:0.75-4.
Inventors
- 👤 Richard F. Reade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:29
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
A frit exhibiting good glass stability, high gloss, a coefficient of thermal expansion (20°-300° C.) between about 50-110×10 -7 /°C., a viscosity suitable for firing at 650°-775° C., and excellent resistance to attack by acids and bases consisting essentially, expressed in weight percent on the oxide basis as calculated from the batch, of: SiO 2 : 29-55 B 2 O 3 : 7-31 Al 2 O 3 : 2-8 ZrO 2 : 5-16 Na 2 O: 4-20 Li 2 O: 0-7 Na 2 O+Li 2 O: 6-24 F: 0.75-4
Claim 2
Dependent Claim
89 words
A frit exhibiting good glass stability, high gloss, a coefficient of thermal expansion (20°-300° C.) between about 50-110×10 -7 /°C., a viscosity suitable for firing at 650°-775° C., and excellent resistance to attack by acids and bases consisting essentially, expressed in weight percent on the oxide basis as calculated from the batch, of: SiO 2 : 29-55 B 2 O 3 : 7-31 Al 2 O 3 : 2-8 ZrO 2 : 5-16 Na 2 O: 4-20 Li 2 O: 0-7 Na 2 O+Li 2 O: 6-24 F: 0.75-4
Claim 3
Dependent Claim
79 words
A frit according to claim 1 exhibiting a coefficient of thermal expansion (20°-300° C.) between 50-80×10 -7 /°C. and a viscosity suitable for firing at 675°-775° C. consisting essentially, expressed in weight percent on the oxide basis as calculated from the batch, of: SiO 2 : 40-55 B 2 O 3 : 16-31 Al 2 O 3 : 5-8 ZrO 2 : 5-14 Na 2 O: 4-10 Li 2 O: 0-7 Na 2 O+Li 2 O: 6-13 F: 0.75-4
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) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |