US3723142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutral gray glass
Assignee: AGC Inc
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Filing: 1970-12-11
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Granted: 1973-03-27
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Expires: 1990-12-11
Abstract
Abstract A NUETRAL GRAY COLORED HEAT ABSORBING GLASS HAVING A LOW EXCITATION PURITY CONSISTS ESSENTIALLY OF THE FOLLOWING BASE COMPONENTS IN PERCENT BY WEIGHT: 68 TO 75%SIO2, 0 TO 5% AL2O3, 5 TO 15% CAO, 0 TO 10% MGO (6 TO 15% CAO+MGO), 10 TO 18% NA2O, 0 TO 5% K2O (10 TO 20% NA2O+K2O) TOGETHER WITH COLORING COMPONENTS OF 0.1 TO 0.5% FE2O3, 0.003 TO 0.02% COO, 0.0005 TO 0.001% SE, AND NEGLIGIBLE NIO.
Inventors
- 👤 S Kato
- 👤 T Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:46
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |