US2527693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft glass having wide working range
Assignee: Corning Glass Works
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Filing: 1946-11-20
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Granted: 1950-10-31
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Expires: 1966-11-20
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:04
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A TRANSPARENT GLASS CONSISTING OF 53% TO 75% SIO2, 3% TO 15% A12O3, 0.1% TO 13% K2O, 0.1% TO 17% NA2O, 0.5% TO 2% LI2O, UP TO 28% BAO, AND 0.5% TO 2.5% F. THE TOTAL PERCENTAGE OF THE ALKALI METAL OXIDES BEING BETWEEN 15% MINUS ONE-THIRD THE PERCENTAGE OF BAO AND 20% MINUS ONE-THIRD THE PERCENTAGE OF BAO, THE SOFTENING POINT OF THE GLASS BEING LESS THAN 720*C., THE DIFFERENCE BETWEEN THE STRAIN POINT AND THE SOFTENING POINT BEING OVER 215*C., THE EXPANSION COEFFICIENT BEING BETWEEN 80X10-7 AND 100X10-7 CM. PER CM. PER DEGREE C., AND THE ELECTRICAL RESISTIVITY BEING GREATER THAN 2X105 OHM CM.
References Cited (Backward Citations)
FR870982A
Cited
US2392314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |