Electric glass melting furnace and method of melting glass
Abstract
Abstract A CONTINUOUS TANK FURNACE HAVING A BATCH FEEDING AND AN OPPOSITE GLASS DISCHARGE END WITH SUBMERGED ELECTRODES FOR SUPPLYING HEAT THE BATCH CONSTITUENTS. THE SPACE ABOVE THE LEVEL OF THE MELT IN THE TANK IS DIVIDED INTO AT LEAST TWO SUCCESSIVE ZONES BY A HANGING TRANSVERSE REFRACTORY WALL WHICH EXTENDS DOWNWARDLY CLOSE TO THE SURFACE OF THE MELT. INDEPENDENTLY CONTROLLED AUXILIARY HEATERS ABOVE THE SURFACES OF THE MELT IN THE TWO ZONES PROVIDE MEANS FOR CONTROLLING THE EXISTENCE OF AND THE DENSITY OR THICKNESS OF THE BATCH COVER ON THE GLASS MELT. THIS MAINTAINS A SUBSTANTIAL BATCH COVER IN THE FIRST ZONE TO RETAIN HEAT WITHIN THE MELT WHILE AUXILIARY HEAT ABOVE THE MELT IN THE SECOND ZONE MINIMIZES THE BLANKETING OR INSULATING EFFECT OF THE BATCH COVER AND THUS PROMOTES LIBERATION OF GASES WHICH WOULD OTHER WISE FORM UNDERSIRABLE SEEDS AND/OR BLISTERS IN THE MOLTEN GLASS.
Inventors
- 👤 Leon F Robertson
- 👤 James W Thomas
Bibliographic Details
Claims Analysis
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |