US3269816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing glass fibers
Assignee: PPG Industries Inc
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Filing: 1964-08-31
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Granted: 1966-08-30
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Helbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A METHOD OF PRODUCING GLASS FIBERS CHARACTERIZED BY EXTENDING MOLTEN GLASS FROM A HEATED BUSHING HAVING A PREDETERMINED STARTUP TEMPERATURE AT WHICH TEMPERATURE THE GLASS EXTRUDING FROM THE BUSHING IS SUITABLE FOR FIBERIZING, COLLECTING SAID FIBERS ON A WINDING PACKAGE OF EVER INCREASING DIAMETER, SAID WINDING PACKAGE BEING ADAPTED TO WIND FOR ONLY A FINITE PERIOD OF TIME, THE IMPROVEMENT COMPRISING, INCREASING THE TEMPERATURE OF SAID BUSHING FROM ITS STARTUP TEMPERATURE THROUGHOUT THE WINDING OPERATION, SENSING A STOP IN THE WINDING OPERATION, AND IN RESPONSE THERETO, RAPIDLY REDUCING THE TEMPERATURE OF THE BUSHING 10*F. TO 30*F. BELOW THE STARTUP TEMPERATURE AT WHICH TEMPERATURE THE VISCOSITY OF THE GLASS AT THE BUSHING IS GREATER THAN THAT AT WHICH THE GLASS IS CAPABLE OF BEING FIBERIZED.
Claim 2
Dependent Claim
125 words
IN A METHOD OF PRODUCING GLASS FIBERS CHARACTERIZED BY EXTENDING MOLTEN GLASS FROM A HEATED BUSHING HAVING A PREDETERMINED STARTUP TEMPERATURE AT WHICH TEMPERATURE THE GLASS EXTRUDING FROM THE BUSHING IS SUITABLE FOR FIBERIZING, COLLECTING SAID FIBERS ON A WINDING PACKAGE OF EVER INCREASING DIAMETER, SAID WINDING PACKAGE BEING ADAPTED TO WIND FOR ONLY A FINITE PERIOD OF TIME, THE IMPROVEMENT COMPRISING, INCREASING THE TEMPERATURE OF SAID BUSHING FROM ITS STARTUP TEMPERATURE THROUGHOUT THE WINDING OPERATION, SENSING A STOP IN THE WINDING OPERATION, AND IN RESPONSE THERETO, RAPIDLY REDUCING THE TEMPERATURE OF THE BUSHING 10*F. TO 30*F. BELOW THE STARTUP TEMPERATURE AT WHICH TEMPERATURE THE VISCOSITY OF THE GLASS AT THE BUSHING IS GREATER THAN THAT AT WHICH THE GLASS IS CAPABLE OF BEING FIBERIZED.
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |