Patent US3752729A successfully refreshed from Google Patents.
US3752729A
Expired / Lapsed
US
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Strengthened glass article
Assignee: Corning Glass Works
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Filing: 1966-05-16
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Granted: 1973-08-14
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Expires: 1986-05-16
Abstract
Abstract THIS INVENTION RELATES TO IMPROVED GLASS COMPOSITIONS FOR USE IN CHEMICAL STRENGTHENING WHEREIN THE POSITION SHAPE OF THE TEMPERATURE VERSUS VISOSITY CURVE IS CHANGED BY THE ADDITION OF MGO AND OPTIONALLY KO2 TO THE GLASS.
Inventors
- 👤 E Mochel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C21/00; C03C21/001; C03C21/002; C03C3/083; C03C3/085; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31; Y10T428/315
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |