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US3241938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of glass sheets
Assignee: PPG Industries Inc
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Filing: 1963-01-15
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Granted: 1966-03-22
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Expires: 1983-01-15
Abstract
No abstract record available.
Inventors
- 👤 Edmund R Michalik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:42
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/04; C03B18/08; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A PROCESS OF PRODUCING GLASS SHEET WHEREIN THE GLASS IS SUPPORTED ON A LIQUID HAVING A DENSITY GREATER THAN THAT OF THE GLASS AND THE GLASS WHEN MOLTEN AND ALLOWED TO FLOW FREELY ON SAID LIQUID TENDS TO NATURALLY ATTAIN AN EQUILIBRIUM THICKNESS, THE IMPROVEMENT WHICH COMPRISES FLOATING A LAYER OF GLASS AT ITS MELTING TEMPPERATURE ON SAID LIQUID, SUBJECTING AN AREA OF THE UPPER SURFACE OF THE GLASS WITHIN THE EDGES THEREOF TO SUBSTANTIALLY ATMOSPHERIC FLUID PRESSURE, AND SUBJECTING LIQUID OUTSIDE AND IN CONTACT WITH THE GLASS TO A FLUID PRESSURE LESS THAN ATMOSPHERIC, THEREBY CONTROLLING THE THICKNESS OF THE GLASS WITHIN THE EDGES THEREOF SO AS TO BE DIFFERENT FROM SAID EQUILIBRIUM THICKNESS.
Claim 2
Dependent Claim
116 words
IN A PROCESS OF PRODUCING GLASS SHEET WHEREIN THE GLASS IS SUPPORTED ON A LIQUID HAVING A DENSITY GREATER THAN THAT OF THE GLASS AND THE GLASS WHEN MOLTEN AND ALLOWED TO FLOW FREELY ON SAID LIQUID TENDS TO NATURALLY ATTAIN AN EQUILIBRIUM THICKNESS, THE IMPROVEMENT WHICH COMPRISES FLOATING A LAYER OF GLASS AT ITS MELTING TEMPPERATURE ON SAID LIQUID, SUBJECTING AN AREA OF THE UPPER SURFACE OF THE GLASS WITHIN THE EDGES THEREOF TO SUBSTANTIALLY ATMOSPHERIC FLUID PRESSURE, AND SUBJECTING LIQUID OUTSIDE AND IN CONTACT WITH THE GLASS TO A FLUID PRESSURE LESS THAN ATMOSPHERIC, THEREBY CONTROLLING THE THICKNESS OF THE GLASS WITHIN THE EDGES THEREOF SO AS TO BE DIFFERENT FROM SAID EQUILIBRIUM THICKNESS.
References Cited (Backward Citations)
DE732043C
Cited
US2911759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |