Patent US3480570A successfully refreshed from Google Patents.
US3200971A
Expired / Lapsed
US
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Apparatus and method for controlling liquid level
Assignee: Owens Corning
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Filing: 1961-08-01
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Granted: 1965-08-17
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Expires: 1981-08-01
Abstract
No abstract record available.
Inventors
- 👤 William C Trethewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:44
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/24; C03B5/245; C03B3/00; G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/161; G01F23/165; G01F23/168; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7339
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
INN A METHOD OF CONTROLLING MOLTED GLASS LEVEL IN A GLASS MELTING FURNACE HAVING A COMBUSTION HEATED GLASS MELTING CHAMBER WHEREIN THE ATMOSPHERIC PRESSURE ABOVE THE MOLTEN GLASS IN SAID CHAMBER FLUCTUATES DUE TO VARIATIONS IN THE COMBUSTIN, THE STEPS OF DISCHARGING A GASEOUS STREAM AT A LOW VELOCITY AND CONSTANT VOLUMETRIC FLOW AT A FIXED POINT BENEATH THE SURFACE OF THE GLASS MELT, THE HYDROSTATIC HEAD OF THE GLASS MELT AND ATMOSPHERIC PRESSURE ABOVE THE MELT DETERMINING THE PRESSURE OF THE GASEOUS STREAM REQUIRED TO MAINTAIN CONSTANT GASEOUS FLOW AS INTERMITTENT SLOW RATE BUBBLING, SENSING THE PRESSURE VARIATIONS IN THE GASEOUS STREAM CAUSED BY CHANGES IN SAID HYDROSTATIC HEAD OF GLAS AND IN SAID COMBUSTION ATMOSPHERE TO PROVIDE A SIGNAL, SENSING SAID COMBUSTION ATMOSPHERE PRESSURE AND SUBTRACTING THE PRESSURE OF SAID ATMOSPHERE FROM SAID SIGNAL TO PROVIDE AN ALTERED SIGNAL, AND UTILIZING SAID ALTERED SIGNAL TO CONTROL THE RATE OF BATCH CHARGING TO THE GLASS MELTING PROOCESS.
Claim 2
Dependent Claim
158 words
INN A METHOD OF CONTROLLING MOLTED GLASS LEVEL IN A GLASS MELTING FURNACE HAVING A COMBUSTION HEATED GLASS MELTING CHAMBER WHEREIN THE ATMOSPHERIC PRESSURE ABOVE THE MOLTEN GLASS IN SAID CHAMBER FLUCTUATES DUE TO VARIATIONS IN THE COMBUSTIN, THE STEPS OF DISCHARGING A GASEOUS STREAM AT A LOW VELOCITY AND CONSTANT VOLUMETRIC FLOW AT A FIXED POINT BENEATH THE SURFACE OF THE GLASS MELT, THE HYDROSTATIC HEAD OF THE GLASS MELT AND ATMOSPHERIC PRESSURE ABOVE THE MELT DETERMINING THE PRESSURE OF THE GASEOUS STREAM REQUIRED TO MAINTAIN CONSTANT GASEOUS FLOW AS INTERMITTENT SLOW RATE BUBBLING, SENSING THE PRESSURE VARIATIONS IN THE GASEOUS STREAM CAUSED BY CHANGES IN SAID HYDROSTATIC HEAD OF GLAS AND IN SAID COMBUSTION ATMOSPHERE TO PROVIDE A SIGNAL, SENSING SAID COMBUSTION ATMOSPHERE PRESSURE AND SUBTRACTING THE PRESSURE OF SAID ATMOSPHERE FROM SAID SIGNAL TO PROVIDE AN ALTERED SIGNAL, AND UTILIZING SAID ALTERED SIGNAL TO CONTROL THE RATE OF BATCH CHARGING TO THE GLASS MELTING PROOCESS.
Claim 3
Dependent Claim
161 words
IN A LEVEL SENSING MECHANISM FOR A GLASS MELTING FURNACE HAVING A MELTING CHAMBER IN WHICH MATERIALS ARE MELTED TO FORM A BODY OF MOLLTEN GLASS AND A FOREHEARTH FROM WHICH MOLTLEN GLASS IS RELEASED, ANND WHEREIN A FLUCTUATING COMBUSTION ATMOSPHEREIN THE MELTING CHAMBER CONTRIBUTES TO FLUCTUATIONS OF THE LIQUID LEVEL IN THE FOREHEARTH, A FIRST PROBE HAVING A TIP SUBMERGED IN THE LIQUID WITHIN THE FOREHEARTH AT A FIXED POINT IN SPACE, MEANS FOR SUPPLYING A GAS TO SAID TIP AT A CONSTANT VOLUMETRIC RATE OF FLOW AND AT A PRESSURE VARIABLE IN ACCORDANCE WITH THE DISTANCE OF SAID TIP BENEATH THE SUURFACE OF THE LIQUID, TO PROVIDE SMALL INDIVIDUAL BUBBLES TRAVELING IN SEQUENCE BETWEEN SAID TIP AND THE SURFACE OF THE LIQUID, A SECOND PROBE OPEN TO SAID FLUCTUATING COMBUSTION ATMOSPHERE, AND MEANS FOR MEASURING THE DIFFERENCE BETWEEN THE GAS PRESURES IN SAID PROBES TO PROVIDE A SIGNAL CORRESPONDING TO VARIATIONS OF LEVEL IN THE BODY OF MOLTEN GLASS.
Claim 4
Dependent Claim
161 words
IN A LEVEL SENSING MECHANISM FOR A GLASS MELTING FURNACE HAVING A MELTING CHAMBER IN WHICH MATERIALS ARE MELTED TO FORM A BODY OF MOLLTEN GLASS AND A FOREHEARTH FROM WHICH MOLTLEN GLASS IS RELEASED, ANND WHEREIN A FLUCTUATING COMBUSTION ATMOSPHEREIN THE MELTING CHAMBER CONTRIBUTES TO FLUCTUATIONS OF THE LIQUID LEVEL IN THE FOREHEARTH, A FIRST PROBE HAVING A TIP SUBMERGED IN THE LIQUID WITHIN THE FOREHEARTH AT A FIXED POINT IN SPACE, MEANS FOR SUPPLYING A GAS TO SAID TIP AT A CONSTANT VOLUMETRIC RATE OF FLOW AND AT A PRESSURE VARIABLE IN ACCORDANCE WITH THE DISTANCE OF SAID TIP BENEATH THE SUURFACE OF THE LIQUID, TO PROVIDE SMALL INDIVIDUAL BUBBLES TRAVELING IN SEQUENCE BETWEEN SAID TIP AND THE SURFACE OF THE LIQUID, A SECOND PROBE OPEN TO SAID FLUCTUATING COMBUSTION ATMOSPHERE, AND MEANS FOR MEASURING THE DIFFERENCE BETWEEN THE GAS PRESURES IN SAID PROBES TO PROVIDE A SIGNAL CORRESPONDING TO VARIATIONS OF LEVEL IN THE BODY OF MOLTEN GLASS.
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |