Patent US4510350A successfully refreshed from Google Patents.
US3794476A
Expired / Lapsed
US
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Method for thermally tempering glass sheet by liquid quenching
Assignee: PPG Industries Inc
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Filing: 1972-12-26
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Granted: 1974-02-26
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Expires: 1992-12-26
Abstract
Abstract A METHOD FOR TEMPERING GLASS SHEET IS DISCLOSED IN WHICH THE GLASS IS HEATED TO A TEMPERATURE ABOVE ITS STAIN POINT, BUT BELOW ITS SOFTENING POINT AND THEN CONTACTED WITH AN OXYALKYLENE POLYMER QUENCHING MEDIUM. THE OXYALKYLENE POLYMERS PROVIDE A RELATIVELY HIGH AND UNIFORM HEAT TRANSFER WHICH MAKES THEM PARTICULARLY USEFUL AS TEMPERING MEDIA FOR THE TEMPERING OF THIN GLASS.
Inventors
- 👤 E Michalik
- 👤 H Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:32
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/02
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |