US3814593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure molding of glass articles apparatus
Assignee: PPG Industries Inc
•
Filing: 1973-01-05
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Granted: 1974-06-04
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Expires: 1993-01-05
Abstract
Abstract APPARATUS FOR PRESSURE GLASS SHEETS, IN PARTICULAR HEMISPHERES, BY CASTING MOLTEN GLASS UNDER PRESSURE BETWEEN GRAHPIT MOLDS WHILE THE MOLDS ARE MAINTEINED WITHIN A DESIRED TEMPRATURE RANGE BELOW A TEMPERATURE AT WHICH MOLTEN GLASS ADHERES TO GRAPHITE AND ABOVE A TEMPERATURE AT WHICH THE MOLDS CAUSE CHILL CRACKING AND OPTICAL DEFECTE IN THE SURFACES OF THE CAST GLASS.
Inventors
- 👤 J Parris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:22
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/02; C03B19/025
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |