US2964414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition and method of making it
Assignee: Corning Glass Works
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Filing: 1958-04-23
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Granted: 1960-12-13
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Expires: 1978-04-23
Abstract
No abstract record available.
Inventors
- 👤 Robert H Dalton
- 👤 George B Hares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/102; C03C3/062; C03C3/07; C03C3/12; C03C3/14; C03C3/145; C03C8/00; C03C8/02; C03C8/10; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/41; H01J29/413
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A GLASS COMPOSITION HAVING AN ELECTRICAL RESISTIVITY GREATER THAN 1 MEGOHM WHEN MEASURED AT A TEMPERATURE OF 250*C. CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT 15% TO 70% SIO2, 5% TO 60% PBO, 5% TO 25% ALKALI METAL OXIDES, 0 TO 5% AL2O3, AND A TOTAL OF 0 TO 15% ALKALINE EARTH METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF MGO, CAO, AND BAO, CHARACTERIZED IN THAT RB2O IS PRESENT IN AN AMOUNT THAT THE RATIO OF RB20 TO TOTAL ALKALI METAL OXIDES IS ABOUT 1/20 TO 3/10.
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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |