US3652303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat absorbing blue soda-lime-silica glass
Assignee: PPG Industries Inc
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Filing: 1970-01-26
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Granted: 1972-03-28
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Expires: 1990-01-26
Abstract
Abstract Blue, heat absorbing glasses, particularly infrared absorbing glasses, which have high transmission in the visible portion of the spectrum and are suitable in flat form for use in the automobile, architectural and other heat-shielding applications are disclosed. These glasses consist essentially of lime, soda, silica, 0.05 to 2.0 percent of iron, said iron being in an ionic state, at least 80 percent of which is in the ferrous state, and 0.1 to 15.0 percent tin, a major portion of which is in the stannous state, the ratio of stannous to ferrous ion on a mole percent bases being at least 1:1.
Inventors
- 👤 Bhogaraju V Janakirama Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:24
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/082; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C3/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
38 words
A transparent glass according to claim 1 consisting essentially by weight of 65 to 80 percent SiO2, 10 to 15 percent Na2O, 5 to 15 percent CaO, 0 to 10 percent MgO, and 0 to 10 percent Al2O3.
References Cited (Backward Citations)
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US3326703A
Cited
US3345190A
Cited
US3506422A
Cited
US3423197A
Cited
US3482955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |