Patent US277305A successfully refreshed from Google Patents.
Patent US3597305A successfully refreshed from Google Patents.
US3597305A
Expired / Lapsed
US
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Subsurface fortified glass or glass-ceramic laminates
Assignee: Corning Glass Works
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Filing: 1968-06-06
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Granted: 1971-08-03
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Expires: 1988-06-06
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 FORTIFICATION COMPRISING AT LEAST ONE INTERNAL COMPRESSIVELY STRESSED LAYER.
Inventors
- 👤 James W Giffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:12
CPC Classifications
C; C03; C03B; C03B27/00; B; B32; B32B; B32B17/00; B32B17/06; C03B17/00; C03B17/02; C03C; C03C17/00; C03C17/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; 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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |