US3241939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of flat glass
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
2026-10-31 16:41
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: 1
Claim 1
Independent Claim
126 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 TEMPERATURE ON A PORTION OF THE SURFACE OF SAID LIQUED, SUBJECTING AN AREA OF THE UPPER SURFACE OF THE GLASS WITHIN THE EDGES THEREOF TO A GAS PRESSURE, AND SUBJECTING LIQUID OUTSIDE AND IN CONTACT WITH THE GLASS TO A FLUID PRESSURE OF DIFFERENT MAGNITUDE THAN THAT OF SAID GAS, THEREBY CONTROLLING THE THICKNESS OF THE GLASS WITHIN THE EDGES THEREOF SO AS TO BE DIFFERENT FROM SAID EQUILIBRIUM THICKNESS.
References Cited (Backward Citations)
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 |