US3582298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency measuring apparatus for controlling the temperature of a glass fiber forming apparatus
Assignee: Owens Corning
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Filing: 1969-04-07
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Granted: 1971-06-01
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Expires: 1989-04-07
Abstract
Abstract THIS INVENTION RELATES TO AN APPARATUS FOR ISSUING STREAMS OF MOLTNE GLASS TO BE ATTENUATED INTO FIBERS. THE TEMPERATURE OF THE MOLTEN GLASS IS SENSED BY A DEVICE GENERATING A FREQUENCY SIGNAL WHICH VARIES IN PROPORTION TO TEMPERATURE VARIATION OF THE MOLTEN GLASS. A KNOWN PERIOD OF THE CYCLIC VARIATION OF THE FREQUENCY SIGNAL IS SELECTED AND A COUNTER COUNTS A PREDETERMINED HIGHER FRE- QUENCY RATE DURING THE KNOWN PERIOD TO PROVIDE A MEASURE OF THE TEMPERATURE OF THE GLASS. THE AMOUNT OF HEAT SUPPLIED TO THE GLASS IS CONTROLLED IN RESPONSE TO THE OUTPUT OF THE COUNTER.
Inventors
- 👤 William C Trethewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:31
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; B; B65; B65H; B65H59/00; B65H59/38; B65H59/384; B65H59/385; C; C03; C03B; C03B37/00; C03B37/07; G01K; G01K7/00; G01K7/32; G05; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20; G05D23/22; B65H2515/00; B65H2515/40; B65H2701/00; B65H2701/30; B65H2701/31; B65H2701/312; B65H2701/3122
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |