US3560183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending glass sheets
Assignee: PPG Industries Inc
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Filing: 1968-09-13
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Granted: 1971-02-02
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Expires: 1988-09-13
Abstract
Abstract BENDING THICK GLASS INTO HERMISPHERICAL SHAPES COMPRISING USING A MOLD OF CONCAVE ELEVATION OF MATERIAL HAVING LESS THERMAL EXPANSIVITY THAN GLASS, SAID MOLD COMPRISING A RING OF RIGID MATERIAL HAVING GREATER THERMAL EXPANSIVITY THAN GLASS AND SUFFICIENTLY SMALLER IN DIAMETER THAN THE MOLD AT GLASS LOADING TEMPERATURE TO SUPORT THE GLASS OVER SAID MOLD AT THE TEMPERATURE AT WHICH THE MOLD IS LOADED AND CAPABLE OF EXPANDING SUFFICIENTLY MORE RAPIDLY THAN THE MOLD TO DEPOSIT THE GLASS ONTO THE MOLD AFTER THE GLASS HAS ATTAINED A SUFFICIENTLY HIGH TEMPERATURE TO DEFORM IN RESPONSE TO EXTERNAL STRESSES.
Inventors
- 👤 George W Stilley
- 👤 John A Comperatore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:52
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0252
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |