Patent US3649440A successfully refreshed from Google Patents.
US3649440A
Expired / Lapsed
US
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Strengthened laminated glass bodies
Assignee: Corning Glass Works
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Filing: 1969-07-09
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Granted: 1972-03-14
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Expires: 1989-07-09
Abstract
Abstract THIS INVENTION RELATES TO THE SUPPLEMENTAL STRENGHENING OF LAMINATED ARTICLES OF GLASS FORMED OF A PLURALITY OF FUSED ADJACENT LAMINAE, WHEREIN EACH LAMINA EXHIBITS A STATE OF STRESS OPPOSITE TO THAT OF THE LAMINA CONTIGUOUS THERETO, BY THERMAL TEMPERING SUCH AS TO GREATLY INCREASE THE IMPACT RESISTANCE OF SUCH ARTICLES AND INHIBIT SPONTANEOUS BREAKAGE THEREOF DUE TO BRUISE CHECKING.
Inventors
- 👤 John E Megles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:47
CPC Classifications
C; C03; C03B; C03B27/00; Y; Y10; Y10T; Y10T428/00; 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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |