Patent US3393987A successfully refreshed from Google Patents.
US3393987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for protecting sheet glass during the thermal treatment thereof
Assignee: AGC Glass Europe SA
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Filing: 1966-05-16
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Granted: 1968-07-23
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Plumat Emile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/14; C03C; C03C21/00; C03C21/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
THE METHOD OF PROTECTING SHEET GLASS SUBJECTED TO THERMAL TREATMENT BETWEEN A MOLTEN METAL BATH WHICH IS DENSER THAN THE GLASS AND A MOLTEN SALT BATH OF A DENSITY NOT GREATER THAN 4, CHARACTERIZED IN THAT THERE IS MEASURED WITH THE SHEET GLASS THEREBETWEEN, THE POTENTIAL DIFFERNCE EXISTING BETWEEN A PLACE IN THE MOLTEN METAL AND A PLACE IN THE MOLTEN SALT, AND THEN APPLYING DIRECT CURRENT ELECTRIC POWER BETWEEN SUCH PLACES IN THE MOLTEN METAL AND THE MOLTEN SALT TO CREATE BETWEEN SUCH PLACES AND ACROSS THE SHEET GLASS A DIRECT CURRENT POTENTIAL DIFFENCE OPPOSED TO AND NOT SUBSTANTIALLY GREATER THAN THE POTENTIAL DIFFERENCE FOUND TO BE EXISTING THEREBETWEEN AND SUFFICIENT TO SUBSTANTIALLY PREVENT THE EMIGRATION OF IONS BETWEEN THE MOLTEN SALT AND THE GLASS, AND BETWEEN THE GLASS AND THE MOLTEN METAL.
Claim 2
Independent Claim
134 words
THE METHOD OF PROTECTING SHEET GLASS SUBJECTED TO THERMAL TREATMENT BETWEEN A MOLTEN METAL BATH WHICH IS DENSER THAN THE GLASS AND A MOLTEN SALT BATH OF A DENSITY NOT GREATER THAN 4, CHARACTERIZED IN THAT THERE IS MEASURED WITH THE SHEET GLASS THEREBETWEEN, THE POTENTIAL DIFFERNCE EXISTING BETWEEN A PLACE IN THE MOLTEN METAL AND A PLACE IN THE MOLTEN SALT, AND THEN APPLYING DIRECT CURRENT ELECTRIC POWER BETWEEN SUCH PLACES IN THE MOLTEN METAL AND THE MOLTEN SALT TO CREATE BETWEEN SUCH PLACES AND ACROSS THE SHEET GLASS A DIRECT CURRENT POTENTIAL DIFFENCE OPPOSED TO AND NOT SUBSTANTIALLY GREATER THAN THE POTENTIAL DIFFERENCE FOUND TO BE EXISTING THEREBETWEEN AND SUFFICIENT TO SUBSTANTIALLY PREVENT THE EMIGRATION OF IONS BETWEEN THE MOLTEN SALT AND THE GLASS, AND BETWEEN THE GLASS AND THE MOLTEN METAL.
Claim 3
Dependent Claim
277 words
THE COMBINATION IN APPARATUS FOR PROTECTING SHEET GLASS BEING SUBJECTED TO A THERMAL TREATMENT BETWEEN THE SURFACES OF A MOLTEN METAL BATH AND A MOLTEN SALT BATH, OF A TANK OF HEAT REFRACTORY MATERIAL PROVIDED ON AT LEAST ONE SIDE WITH A HORIZONTAL SLOT THROUGH WHICH THE GLASS SHEET IS INSERTED INTO THE TANK, SAID TANK BEING PROVIDED WITH A PAIR OF ELECTRODES, ONE OF SUCH ELECTRODES BEING LOCATED AT A LEVEL HIGHER THAN THAT OF THE HORIZONTAL SLOT AND THE OTHER ELECTRODE BEING LOCATED AT A LEVEL BELOW THAT OF SAID SLOT, THE TANK CONTAINING UP TO THE LEVEL OF THE SLOT A LOWER BATH OF MOLTEN MATERIAL WHICH IS DENSER THAN THE GLASS AND CONSTITUTED OF AT LEAST ONE METAL SELECTED FROM THE GROUP COMPRISING TIN, LEAD, ZINC, COPPER, ALUMINUM AND SILVER, AND ABOVE THE LEVEL OF SAID SLOT AN UPPER BATH OF MOLTEN MATERIAL HAVING A DENSITY NOT GREATER THAN 4, AND CONSTITUTED OF A MOLTEN SALT OF ONE OR MORE METALS SELECTED FROM THE GROUP COMPRISING A ALKALI OR ALKALINE EARTH METALS, COBALT, MANGANESE, BARIUM, CALCIUM, COPPER, LITHIUM, MAGNESIUM, POTASSIUM, SILVER, SODIUM AND CHROMIUM, AND THE HALIDES THEREOF, SO THAT SAID ONE ELECTRODE IS SITUATED IN SAID UPPER BATH AND SAID OTHER ELECTRODE IS SITUATED IN SAID LOWER BATH, AND THE GLASS SHEET IS INSERTED BETWEEN THE SURFACES OF SUCH TWO BATHS AND IS EXPOSED TO AN ELECTRICAL POTENTIAL DIFFERENCE APPLIED BY THE ELECTRODES IN SUCH BATHS, AND MEANS FOR CAUSING SAID ELECTRODES TO APPLY AN ELECTRICAL DIRECT CURRENT POTENTIAL DIFFERNCE THAT WILL MODIFY THE POTENTIAL DIFFERENCE EXISTING BETWEEN SAID UPPER AND LOWER BATHS AS A RESULT OF THE BARRIER ION DIFFUSION THEREBETWEEN.
Claim 4
Dependent Claim
277 words
THE COMBINATION IN APPARATUS FOR PROTECTING SHEET GLASS BEING SUBJECTED TO A THERMAL TREATMENT BETWEEN THE SURFACES OF A MOLTEN METAL BATH AND A MOLTEN SALT BATH, OF A TANK OF HEAT REFRACTORY MATERIAL PROVIDED ON AT LEAST ONE SIDE WITH A HORIZONTAL SLOT THROUGH WHICH THE GLASS SHEET IS INSERTED INTO THE TANK, SAID TANK BEING PROVIDED WITH A PAIR OF ELECTRODES, ONE OF SUCH ELECTRODES BEING LOCATED AT A LEVEL HIGHER THAN THAT OF THE HORIZONTAL SLOT AND THE OTHER ELECTRODE BEING LOCATED AT A LEVEL BELOW THAT OF SAID SLOT, THE TANK CONTAINING UP TO THE LEVEL OF THE SLOT A LOWER BATH OF MOLTEN MATERIAL WHICH IS DENSER THAN THE GLASS AND CONSTITUTED OF AT LEAST ONE METAL SELECTED FROM THE GROUP COMPRISING TIN, LEAD, ZINC, COPPER, ALUMINUM AND SILVER, AND ABOVE THE LEVEL OF SAID SLOT AN UPPER BATH OF MOLTEN MATERIAL HAVING A DENSITY NOT GREATER THAN 4, AND CONSTITUTED OF A MOLTEN SALT OF ONE OR MORE METALS SELECTED FROM THE GROUP COMPRISING A ALKALI OR ALKALINE EARTH METALS, COBALT, MANGANESE, BARIUM, CALCIUM, COPPER, LITHIUM, MAGNESIUM, POTASSIUM, SILVER, SODIUM AND CHROMIUM, AND THE HALIDES THEREOF, SO THAT SAID ONE ELECTRODE IS SITUATED IN SAID UPPER BATH AND SAID OTHER ELECTRODE IS SITUATED IN SAID LOWER BATH, AND THE GLASS SHEET IS INSERTED BETWEEN THE SURFACES OF SUCH TWO BATHS AND IS EXPOSED TO AN ELECTRICAL POTENTIAL DIFFERENCE APPLIED BY THE ELECTRODES IN SUCH BATHS, AND MEANS FOR CAUSING SAID ELECTRODES TO APPLY AN ELECTRICAL DIRECT CURRENT POTENTIAL DIFFERNCE THAT WILL MODIFY THE POTENTIAL DIFFERENCE EXISTING BETWEEN SAID UPPER AND LOWER BATHS AS A RESULT OF THE BARRIER ION DIFFUSION THEREBETWEEN.
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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |