Patent US3900329A successfully refreshed from Google Patents.
US3900329A
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Glass compositions
Assignee: OI Glass Inc
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Filing: 1969-10-23
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Granted: 1975-08-19
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Expires: 1989-10-23
Abstract
Abstract Glass compositions characterized by consisting essentially on a percent by weight basis of 43-63% SiO2, 14-25% Al2O3, 0 to 30% CaO, 0 to 20% MgO, where the total CaO + MgO expressed as CaO mole equivalent is from 10 to 30% by weight and the total alkali metal oxide expressed as Na2O mole equivalent ranges from 5 to 15%. The log viscosity of these glasses at its liquidus temperature is at least 2.3 and the liquidus temperature ranges from about 2,035* to about 2,320*F. Cooling time for these glasses is less than 96 seconds, for example, in the range of 55 to 68 seconds.
Inventors
- 👤 Everett F Grubb
- 👤 Erwin C Hagedorn
- 👤 Joseph R Monks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:37
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
A GLASS HAVING AN OXIDE COMPOSITION CONSISTING ESSENTIALLY, ON A PERCENT BY WEIGHT BASIS, OF
Claim 2
Dependent Claim
15 words
A GLASS HAVING AN OXIDE COMPOSITION CONSISTING ESSENTIALLY, ON A PERCENT BY WEIGHT BASIS, OF
Claim 3
Dependent Claim
12 words
The glass of claim 1 wherein said oxide composition is as follows:
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |