US3218141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making thermoplastic sheet material
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1960-12-13
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Granted: 1965-11-16
•
Expires: 1980-12-13
Abstract
No abstract record available.
Inventors
- 👤 Lambert Roger Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B17/00; C03B17/06; C03B17/061; C03B35/00; C03B35/14; C03B35/16; C03B35/168
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A METHOD OF FORMING A SHEET OF GLASS THAT COMPRISES FLOATING A MOLTEN BATH OF GLASS AT FIRE POLISHING TEMPERATURE UPON A COOLER, DENSER LIQUID BATH INERT TO AND IMMISCIBLE WITH THE GLASS, MAINTAINING THE PORTIONS OF THE GLASS BATH AND THE DENSER BATH WHICH ARE IN CONTIGUOUS RELATION AT TEMPERATURE WHICH PRODUCE A CONGEALING OF MOLTEN GLASS AS A PELLICLE ON THE BOTTOM OF THE GLASS BATH, AND A PROGRESSIVE THICKENING OF THE SHEET AS THE SHEET IS DRAWN ALONG THE DENSER BATH, DRAWING AID PELLICLE OF GLASS ALONG THE SURFACE OF THE DENSER BATH AND THEREBY THICKENING THE GLASS SHEET BY ACCRETION, DRAWING THE GLASS SHEET OFF FROM BETWEEN THE SUPERIMPOSED BATHS AS IT ATTAINS A SELECTED THICKNESS, AND COOLING THE SHEET.
Claim 2
Independent Claim
124 words
A METHOD OF FORMING A SHEET OF GLASS THAT COMPRISES FLOATING A MOLTEN BATH OF GLASS AT FIRE POLISHING TEMPERATURE UPON A COOLER, DENSER LIQUID BATH INERT TO AND IMMISCIBLE WITH THE GLASS, MAINTAINING THE PORTIONS OF THE GLASS BATH AND THE DENSER BATH WHICH ARE IN CONTIGUOUS RELATION AT TEMPERATURE WHICH PRODUCE A CONGEALING OF MOLTEN GLASS AS A PELLICLE ON THE BOTTOM OF THE GLASS BATH, AND A PROGRESSIVE THICKENING OF THE SHEET AS THE SHEET IS DRAWN ALONG THE DENSER BATH, DRAWING AID PELLICLE OF GLASS ALONG THE SURFACE OF THE DENSER BATH AND THEREBY THICKENING THE GLASS SHEET BY ACCRETION, DRAWING THE GLASS SHEET OFF FROM BETWEEN THE SUPERIMPOSED BATHS AS IT ATTAINS A SELECTED THICKNESS, AND COOLING THE SHEET.
Claim 3
Dependent Claim
149 words
APPARATUS FOR FORMING SHEET GLASS COMPRISING A FIRST TANK ADAPTED TO CONTAIN A MOLTEN METAL, A SECOND TANK ADAPTED TO CONTAIN MOLTEN GLASS, MEANS TO DELIVER A BATH OF MOLTEN GLASS FROM THE SECOND TANK TO THE TOP OF THE MOLTEN METAL, MEANS TO MAINTAIN METAL AND GLASS AT TEMPERATURES AT WHICH THE PORTION OF THE GLASS BATH CONTIGUOUS TO THE METAL FORMS A PELLICULAR SHEET AND THE BATH OF MOLTEN GLASS THEREABOVE REMAINS FLUID, MEANS TO DRAW THE SHEET THROUGH THE FIRST TANK, WHEREBY TO INCREASE ITS THICKNESS, MEANS TO REMOVE THE SHEET FROM BETWEEN THE BATH OF MOLTEN GLASS AND THE MOLTEN METAL, AND MEANS TO COOL THE SHEET COMPRISING A ROLLER IMMERSED IN THE METAL AND THE GLASS HAVING ITS OUTER SURFACE ALIGNED TO RECEIVE THE SHEET AND LIFT IT OUT OF THE BATH, MEANS TO TURN THE ROLLER, AND MEANS TO COOL THE WITHDRAWN SHEET.
Claim 4
Dependent Claim
149 words
APPARATUS FOR FORMING SHEET GLASS COMPRISING A FIRST TANK ADAPTED TO CONTAIN A MOLTEN METAL, A SECOND TANK ADAPTED TO CONTAIN MOLTEN GLASS, MEANS TO DELIVER A BATH OF MOLTEN GLASS FROM THE SECOND TANK TO THE TOP OF THE MOLTEN METAL, MEANS TO MAINTAIN METAL AND GLASS AT TEMPERATURES AT WHICH THE PORTION OF THE GLASS BATH CONTIGUOUS TO THE METAL FORMS A PELLICULAR SHEET AND THE BATH OF MOLTEN GLASS THEREABOVE REMAINS FLUID, MEANS TO DRAW THE SHEET THROUGH THE FIRST TANK, WHEREBY TO INCREASE ITS THICKNESS, MEANS TO REMOVE THE SHEET FROM BETWEEN THE BATH OF MOLTEN GLASS AND THE MOLTEN METAL, AND MEANS TO COOL THE SHEET COMPRISING A ROLLER IMMERSED IN THE METAL AND THE GLASS HAVING ITS OUTER SURFACE ALIGNED TO RECEIVE THE SHEET AND LIFT IT OUT OF THE BATH, MEANS TO TURN THE ROLLER, AND MEANS TO COOL THE WITHDRAWN SHEET.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |