Patent US3317302A successfully refreshed from Google Patents.
US3317302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing flat glass on a bi-level forming surface
Assignee: PPG Industries Inc
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Filing: 1963-10-15
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Granted: 1967-05-02
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Expires: 1983-10-15
Abstract
No abstract record available.
Inventors
- 👤 George W Misson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:17
CPC Classifications
C; C03; C03B; C03B35/00; C03B35/14; C03B35/22; C03B35/24; C03B35/246; C03B13/00; C03B13/04; C03B18/00; C03B18/02; C03B18/04; C03B18/18; C03B18/20; C03B18/22; C03B29/00; C03B29/04; C03B29/06; C03B29/08; C03B29/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
207 words
A METHOD OF MANUFACTURING FLAT GLASS HAVING A THICKNESS ON THE CENTRAL PORTION THEREOF LESS THAN THE NORMAL EQUILIBRIUM THICKNESS COMPRISING: FORMING A HORIZONTALLY DISPOSED ELONGATED SUPPORTING SURFACE FOR SUPPORTING MOLTEN GLASS, SAID SUPPORTING SURFACE INCLUDING AN ELONGATED CENTRAL PORTION HAVING A LEVEL UPPER SURFACE BETWEEN ELONGATED EDGE PORTIONS EACH HAVING AN UPPER SURFACE EXTENDING LATERALLY OF SAID CENTRAL PORTION, ADJUSTING THE ELEVATION BETWEEN THE LEVEL OF THE UPPER SURFACE OF SAID CENTRAL PORTION AND THE LEVEL OF THE UPPER SURFACES OF THE ADJACENT EDGE PORTIONS UNTIL THE LEVEL OF SAID UPPER SURFACE OF SAID CENTRAL PORTION IS ABOVE THE LEVEL OF SAID EDGE PORTIONS, DEPOSITING A MASS OF MOLTEN GLASS AT A TEMPERATURE THROUGHOUT THE MASS THEREOF AT WHICH IT WILL FLOW ON SAID ELONGATED SUPPORTING SURFACE, FLOWING SAID MASS OF MOLTEN GLASS AND THE FREE EDGES THEREOF LATERALLY OVER SAID CENTRAL PORTION, AND OVER THE SURFACES OF SAID EDGE PORTIONS TOWARD EQUILIBRIUM THICKNESS, MOVING SAID MOLTEN GLASS LONGITUDINALLY OVER SAID ELONGATED SUPPORTING SURFACE, COOLING THE LEADING PORTION OF SAID MOLTEN GLASS TO FIX ITS CROSS SECTION, AND REMOVING THE COOLED GLASS FROM SAID ELONGATED SUPPORTING SURFACE TO PROVIDE A RIBBON OF GLASS HAVING A THICKNESS IN THE CENTRAL PORTION THEREOF LESS THAN THE EQUILIBRIUM THICKNESS.
Claim 2
Independent Claim
207 words
A METHOD OF MANUFACTURING FLAT GLASS HAVING A THICKNESS ON THE CENTRAL PORTION THEREOF LESS THAN THE NORMAL EQUILIBRIUM THICKNESS COMPRISING: FORMING A HORIZONTALLY DISPOSED ELONGATED SUPPORTING SURFACE FOR SUPPORTING MOLTEN GLASS, SAID SUPPORTING SURFACE INCLUDING AN ELONGATED CENTRAL PORTION HAVING A LEVEL UPPER SURFACE BETWEEN ELONGATED EDGE PORTIONS EACH HAVING AN UPPER SURFACE EXTENDING LATERALLY OF SAID CENTRAL PORTION, ADJUSTING THE ELEVATION BETWEEN THE LEVEL OF THE UPPER SURFACE OF SAID CENTRAL PORTION AND THE LEVEL OF THE UPPER SURFACES OF THE ADJACENT EDGE PORTIONS UNTIL THE LEVEL OF SAID UPPER SURFACE OF SAID CENTRAL PORTION IS ABOVE THE LEVEL OF SAID EDGE PORTIONS, DEPOSITING A MASS OF MOLTEN GLASS AT A TEMPERATURE THROUGHOUT THE MASS THEREOF AT WHICH IT WILL FLOW ON SAID ELONGATED SUPPORTING SURFACE, FLOWING SAID MASS OF MOLTEN GLASS AND THE FREE EDGES THEREOF LATERALLY OVER SAID CENTRAL PORTION, AND OVER THE SURFACES OF SAID EDGE PORTIONS TOWARD EQUILIBRIUM THICKNESS, MOVING SAID MOLTEN GLASS LONGITUDINALLY OVER SAID ELONGATED SUPPORTING SURFACE, COOLING THE LEADING PORTION OF SAID MOLTEN GLASS TO FIX ITS CROSS SECTION, AND REMOVING THE COOLED GLASS FROM SAID ELONGATED SUPPORTING SURFACE TO PROVIDE A RIBBON OF GLASS HAVING A THICKNESS IN THE CENTRAL PORTION THEREOF LESS THAN THE EQUILIBRIUM THICKNESS.
References Cited (Backward Citations)
US3223501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |