US3746526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming subsurface fortified laminates
Assignee: Corning Glass Works
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Filing: 1971-03-10
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Granted: 1973-07-17
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Expires: 1991-03-10
Abstract
Abstract THIS INVENTION RELATES TO HIGH STRENGTH GLASS, GLASSCERAMIC, OR GLASS AND GLASS-CERAMIC LAMINATES HAVING SUBSURFACE FORTIFICATION WHEREBY A CRACK RESULTING FROM THE FRACTURE OF AN OUTER COMPRESSIVELY STRESSED LAYER OF THE LAMINATE IS PREVENTED FROM PROPAGATING THROUGHOUT THE ENTIRE CROSS SECTION OF THE LAMINATE BY A SUBSURFACE FORTIFI- CATION COMPRISING AT LEAST ONE INTERNAL COMPRESSIVELY STRESSED LAYER.
Inventors
- 👤 J Giffon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
C; C03; C03B; C03B27/00; C03B23/00; C03B23/20; C03C; C03C17/00; C03C17/02
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |